before的用法是很多的人都比较想要了解的，在众人的心中before的用法是比较难的，我们都非常想要去了解before的用法，但是又谈何容易呢为了让大家更加快速的了解before的用法，下面我们就和教师一起去看看吧，希望对大家有所帮助。
prep.在……之前;先于，优于;当着……的面;与其……
conj.在……之前;在……以前;比……早些;与其……
adv.先前，从前;在前，在前方
before一词含义广泛，是高考考查的热点词汇之一，但部分考生对该词的用法模糊不清。为了帮助大家掌握，现就对before的用法归纳如下：
一、 before用作连词
1. before用作连词时，意思是“在……之前;还没来得及…… 就”。强调主句或从句谓语动词表示的动作发生得过早或过快?例如：Before she could move, she heard a great noise, which grew to a terrible roar. 她还没来得及动弹，就听见有很响的声音，接着就成了可怕的隆隆轰鸣声。
Before I could say a word, she had stormed out of the room. 不等我说一句话，她就冲出了房间。
Don’t count your chickens before they are hatched. 不要高兴得过早。
I must finish my homework before I watch TV.我必须做完作业才能看电视。
It still took seven years before they finally got married.?过了七年他们才最终得以成婚。
It will be only a few minutes before she comes back.?她过几分钟就会回来。
He announced the ending of the meeting before I could get in a word.?没容得我插上一句话,他就宣布散会了??
Someone called me up in the middle of the night, but they hung up before I could answer the phone.有人半夜给我打电话,但我还未来得及接他就把电话挂断了??
They had talked only a few minutes before they found they were quite different in opinion.他们才谈了几分钟就发现他们的意见很不一致??
注意：before从句若是一个将来的动作，则用一般现在时代替一般将来时，
如上句中的comes。
2. 用于It + be + 时间段 + before...句型中，意思是“在……之后才……”。例如：
It will be five years before I come back.
我五年后才能回来。
It was not long before the enemy was driven out of their country. 不久之后，敌人就被赶走了。
如果主句中用否定式，则表示“不多久……就”。
It won’t be long before they understand each other. 他们不久就会互相了解的。
3. 还有“趁……(还没有)”之意。例如：
They are thinking of buying the house before the prices go up. 他们正在考虑趁房价未涨时把房子买下来。
Do it before you forget it. 趁早动手，以免忘了。
二、before用作介词
before用作介词时, 可以指时间“earlier than在……之前”，也可以指位置“in front of在……之前”。例如：
（1）表示时间，与after相对。如：
August comes before September. 8月份在9月份之前。
There is nothing that has not been bitter before being ripe. 凡事在成熟前，都是有苦味的。
（2）表示顺序，与after?相对。如：
Ladies before gentlemen.女士优先。
（3）表示位置，与behind相对（相当于in front of）。如：
Before Lucy is Lily.?莉莉在露茜的前面。
Don’t put the cart before the horse. 不要本末倒置。
（4）表示“在……面前；与……面对面”。如：
The poor little boy was brought before the headmaster.?那个可怜的小男孩被带到校长面前。
He was brought before the judge. 他被带到法官面前。
（5）表示“宁可……而不愿……”。如：
Death before dishonour.?宁死不辱。
三、before用作副词
（1）before用作副词时，意思是“at an earlier time / in the past以前”。表示“以前；已经”，单独在句中作状语，句子常用完成时态。如：I have seen that film before.我以前看过那部电影。
I’ve seen the film Titanic before. 我以前看过《泰坦尼克》这部电影。
I have never seen such beautiful flowers before. 我以前从未见过如此美丽的鲜花。
注意：①区别于ago: ago用在时间段之后，表示某个时间点，句子用一般过去时。如：
I saw that film three years ago.我三年前看了那部电影。
②含有ago?时间状语的直接引语变间接引语时，ago?应变为before。如：He said to me, “I saw that film three years ago.”
→He told me that he had seen that film three years before.
(2)指空间或位置，表示“在前面”。如：
Look at the page before.看前面一页。
四、
4.?几个需要注意的地方
（1）ever before,单独用作状语，表示“以前”；ever since,?单独用作状语，表示“自从那时以来”；ever after,?单独用作状语，表示“以后；后来”。
（2）before long,单独用作状语，表示“不久以后”，其中long?为名词，后面不接任何成分；可以用于各种时态。例如：
Before long, he went to America. 不久，他就去了美国。
I hope to see you before long. 我希望不久后再见到你。
long before：①单独用作状语，表示“很久以前”，其中before为副词，其后不接任何成分；一般用在过去时或过去完成时的句子里。②表示“在……之前很久”，其中before用作介词或连词，后可接名词、动名词、代词或从
句。
She said she had read the novel long before. 她说她很久以前就读过这部小说。
That happened long before. 那件事发生在很久以前。
（3）when/ while/ if/ unless/ once/ even though?等引导从句时，如果从句主语和主句的主语相同或为it,并且从句谓语含有be动词，则可以省略从句的主语和be动词部分，形成“when / while / if / unless /once /even though +V-ing或V-ed分词”结构；但是before和after?则不用这一句式，二者后只接动名词或者完整的从句。如：
①When (it is ) translated into English, the word means “newspaper”.其中it is可省略
②Before being operated on, he took some special medicine.
其中being operated on?为动名词的被动式，being?不可省略。
before可以用作连词,引导时间状语从句?它用法灵活?译法多变,是高考的一个重要考点?现对其用作连词时的用法加以总结,希望对同学们有所帮助??
1. 【高考题例】?(加下划线的选项为正确答案)?
①?(2006四川) —Why didn’t you tell him about the meeting?
—He rushed out of the room______I could say a word.?
A. before
B. until
C. when
D. after?
②?(2003北京) He made a mistake, but then he corrected the situation______it got worse.?
A. until
B. when
C. before
D. as?
2. before作“……才……”解时,强调从句谓语动词表示的动作发生得太慢或太晚?例如:?
The bus driver almost knocked me down before he saw me.?那位公交车司机差一点把我撞倒,他才看到了我??
The fire lasted about four hours before the firefighters were able to control it.?大火持续了大约四个小时,消防队员才把火控制住??
【高考题例】?(加下划线的选项为正确答案)?
③?(NMET 2004,?Ⅳ) Several weeks had gone by______I realized the painting was missing.?
A. as
B. before
C. since
D. when?
④?(2005广东) The American Civil War lasted four years______the North won in the end.?
A. after
B. when
C. before
D. then?
3. before可译为“趁……”?“以免”?“以防”等?例如:?
I’ll do it now before I forget it.?趁还没有忘,我现在就把这事做了??
We’d better finish the work in time before the boss scolds us.?我们最好按时完成这项工作,免得挨老板的骂??
4. before可译为“(宁可……而)不愿”?例如:?
He’d die before he apologizes to them.?他宁死也不向他们道歉??
I’d give up the plan before I turn to him for help.?我宁可放弃计划也不会向他求助??
5.?注意“It + b e +?一段时间?+ before从句”中主句和从句的时态??
该句式中,主句和从句的时态有两种情况:如果主句用一般将来时,则从句用一般现在时,意为“多长时间以后某事即将发生”;如果主句用过去时,从句也用过去时,意为“多长时间后某事才发生”?
【高考题例】?(加下划线的选项为正确答案)?
⑤?(2006福建) —How long do you think it will be______China sends
a manned spaceship to the moon?
—Perhaps two or three years.?
A. when
B. until
C. that
D. before?
⑥?(2005山东) It was some time______we realized the truth.?
A. when
B. until
C. since
D. before?
练一练:?
1. (2002上海春) It______long before we______the result of the experiment.?
A. will not be; will know
B. is; will know?
C. will not be; know
D. is; know?
2. (2004福建) Scientists say it may be five or six
years????______it is possible to test this medicine on human patients.?
A. since
B. after
C. before
D. when?
3. (2004天津) It was evening ______we reached the little??town of Winchester.?
A. that
B. until
C. since
D. before?
4. —Why didn’t you help the little boy?
—Oh, sorry. He had struggled to his feet ______I ran over.?
A. before
B. after
C. until
D. since?
5. Time passed quickly and three weeks went by ______we knew it.?
A. before
B. after
C. when
D. till?
6. She was such a proud person that she would die??______she would admit she was wrong.?
A. rather than
B. until?
C. after
D. before?
7. We had to sell the vegetables at a low price ______they??rotted away.?
A. after
B. before
C. when
D. until?
8. A dozen ideas were considered ______the chief architect decided on the design of the building.?
A. because
B. before
C. whether
D. unless?
Key: 1. C2. C3. D4. A5. A6. D7. B8. B
Keep的用法： keep vt., vi. kept, keeping 保留；保守 I keep old letters.我保存旧信。 I'll keep the original copy of your report on file. 我会把你报告的原件归档的。 It's an interesting suggestion and we'll keep it on ice." 这是一项有趣的建议,我们将留待以后考虑采用。" 保持；继续 We will keep on trying and, if we get anything done, will notify you. 我们将继续努力，有结果将通知你。 Leaders shouldn't keep themselves aloof from the masses. 领导人决不应该脱离群众。 Keep calm!安静! You shouldn't keep chopping and changing like this; you'd better make up your mind right now! "你不能再这样变化无常了,最好现在就拿定主意!" 遵守 He keeps to his promise.他守约。 "Everyone should keep discipline, and you, officers are no exception." "每个人都应该遵守纪律,你们军官也不例外。" 保卫；保护 Keep the baby warm.别把婴儿冻着。（常与from连用）防止；抑制 Keep one's temper。抑制住不发脾气。 Keep a curb on your anger.请抑制住怒气。 扣留；留下 Please keep me a place in the queue.请在队里给我留个位置。 赡养；饲养 to keep a dog养狗 Farmers usually keep chickens in their backyard. 农民们通常在自己的后院养鸡。 经营；经销；管理 to keep a shop开商店 to keep house治家 （常与from连用）远离；不接触 Keep away from the scene of the accident.勿靠近事故现场。 Their dog looked dangerous, we decided to keep our distance from it. 他们家那条狗样子很凶恶,因此我们决定离它远一点。 But the stone walls keep the farmer's cows from joining his neighbor's cows. 但是石头墙使这家农民的母牛不会加入到邻居的牛群中去。
☆形容词的比较级☆ 当我们需要对事物作出比较时，需要用到比较级。 比较级的句子结构通常是： 什么 + 动词be (am , is , are ) + 形容词比较级 + than（比）+ 什么 ,如： I’m taller and heavier than you. （我比你更高和更重。） An elephant is bigger than a tiger.（一只大象比一只老虎更大。）形容词的比较级是在形容词的基础上变化而来的，它的变化规则是： ①一般的直接在词尾加er ，如 tall - taller , strong - stronger , ②以e结尾的，直接加r ，如 fine – finer , ③以辅音字母加y结尾的，先改y为i再加er，如funny - funnier ④双写最后的字母再加er，如big – bigger, thin – thinner , hot – hotter 除此之外，还有几个特殊的单词，它的比较级和最高级都是不规则的，如：many / much（原形）– more（比较级）– most（最高级） little / few（原形）– less （比较级）– least（最高级） good（原形）– better（比较级）– best（最高级） bad （原形）– worse（比较级）– worst（最高级） far （原形）– further– furthest 附加：形容词的最高级变化类似于比较级，只是把词尾的er改成est，如： tall （原形）- taller （比较级）- tallest （最高级） long（原形）- longer（比较级）- longest（最高级） big （原形）- bigger（比较级）- biggest（最高级） ☆注意☆比较的两者应该是互相对应的可比较的东西。
after用法小议 通常用于过去时、现在时（主将从现）或完成时态的句子中。 1. 1. 用作介词，与一段时间连用表示“在…之后”时，注意它与 in的区别：after表示以过去时间为起点的一段时间以后，且通常与过去时态连用；而in则表示以现在为起点的一段时间以后：He came back after two days. 他两天后就回来了。He will come back in two days. 他过两天就回来。但 after 若是与一点时间连用，则可与过去时态也可与将来时态连用：He came back after 4 o’clock. 他是四点钟以后回来的。 He will come back after next month. 他将在下个月以后回来。 eg. 2. I played computer games after I had finished my homework. 做完功课后，我玩电脑游戏。(从句的动作发生在主句的动作前，因此，主句用一般过去式，从句用过去完成时．) Before和after引导的时间状语从句中，由于before和after 本身的词义已经能够表明动作发生的先后，所以主句可以用一般时代替完成时，也可以用完成时。 I knew/had known her long before you knew her.我认识她早在你认识他之前。 After you finish/have finished all your homework,you can watch TV this evening.你完成所有的作业后，今晚可以看电视。
2. 用作连词引导时间状语从句时注意：若主句用将来时态 (或含有将来意味)，则时间状语从句要用一般现在时态 (表将来意义)表将来意义，而不能直接使用将来时态：他回来后我就走。正：I’ll leave after he comes back. 误：I’ll leave after he will come back. 3. 用作副词，表示“后来”、“ (一段时间)以后”，通常放在表示时间的副词之后：soon after 不久以后 two days after两天后 The plane was hijacked soon after it took off. Two days later he was gone. 4. 用于习语after all 终究，毕竟：I was right after all. 毕竟我是对的。After all, he’s only six years old. 毕竟，他才六岁。 before用法小结 请先看2005年广东省的一道高考题： The American Civil War lasted four years _______ the North won in the end. A. after B. before C. when D. then
1.keep +形容词 2.keep+sth/sb +形容词 3.keep +doing 一直做某事 4.keep ... from doing ... 阻止做某事。。。 5.keep a pet 饲养一个宠物 6.How long may I keep this book ？ keep指借。 keep的用法小结 keep是高考常考词汇之一，其含义丰富，与其搭配的短语也很多，其主要用法如下： A、用作及物动词 （1）保留、保存、保持、留下 e.g. We'd better keep a seat for him. 我们最好给他留个座位。 He kept all the money in the bank. 他把所有的钱都存入了银行。 （2）履行（诺言）遵守 e.g. One should keep one's promise. 一个人应当遵守自己的诺言。 Everybody must keep the law. 人人都必须守法。 （3）赡养，养活，饲养 e.g. He has a large family to keep. 他有一大家人要养活。 The old man kept many animals like dogs, pigs and cats. 这位老人养了许多动物，像狗、猪、还有猫等。 （4）经营，管理
e.g. He kept a hotel in this city. 在这座城市里，他开了一家旅店。 She is good at keeping house. 她擅长管理家务。 （5）保守（秘密），记（日记、帐） e.g. All of the people keep the Spring Festival in our country. 我国所有的人都庆祝春节。 Some of them keep birthdays. 他们中有些人庆祝生日。 （7）使……处于某种状态（情况） 在这种情况下，keep常跟复合结构（keep＋宾语＋补语）。用作宾语补足语常见的词有现在分词、过去分词、形容词、副词以及介词短语。 e.g. He kept me waiting for half an hour. 他让我等了半个小时。 Keep your mouth shut and your eyes open. 少说话，多观察。 The doctor kept me in for a week. 医生一周没让我出去。 He always keeps his books in good order. 他总是把书放得整整齐齐。 B、用作不及物动词 （1）保持、继续（处于某种状态）（keep为连系动词）
比较级的用法知识点总结 1.可以修饰比较级的词，much，a lot，far，…的多a little， a bit，…一点儿 even甚至，still仍然 例如，Lesson One is much easier than Lesson Two.第一课比第二课容易得多。 She drives still more carefully than her husband.她开车仍然比她丈夫还认真。 2.比较级常用的句型结构 （1）“甲+be+（倍数）+形容词比较级+than+乙”表示“甲比乙…”或“甲比乙…几倍” 例如，Tom is taller than Kate.汤姆比凯特高。 “甲+实意动词+（倍数）+副词比较级+than+乙”表示“甲比乙…”或“甲比乙…几倍” 例如，I got up earlier than my mother this morning.我今天早晨起床比我妈妈还早。 （2）“甲+be+形容词比较级+than+any other+单数名词（+介词短语）”表示“甲比同一范围的任何一个人/物都……”，含义是“甲最……”。 例如，The Yangtze River is longer than any other river in China. =The Yangtze River is longer than any of the other rivers in China.长江比中国的任何一条其他的河都长。
=The Yangtze River is longer than the other rivers in China.长江比中国的其他所有的河都长。 =The Yangtze River is the longest river in China.长江是中国最长的河流。 注意：The Yangtze River is longer than any river in Japan.长江比日本的任何一条河都长。 “甲+实意动词+副词比较级+than+anyother+单数名词（+介词短语）”表示“甲比同一范围的任何一个人/物都……”，含义是“甲最……”。 例如，Mike gets to school earlier than any other student in his class. = Mike gets to school earlier than any of the other students in his class.迈克比他们班上任何一个其他的同学到校都早。 = Mike gets to school earlier than the other students in his class.迈克比他们班上其他的同学到校都早。 = Mike gets to school earliest in his class.迈克在他们班 到校最早。 注意：Mike gets to school earlier than any student in Tom’s class.迈克比汤姆班上任何一个学生到校都早。（迈克和汤姆不是同一个班） （3）“甲+be+the+形容词比较级+of the two+……”表示“甲是两者中较……的”。
before的详细用法 Before 在英语中是一个比较常用的虚词，它既可作介词或副词用，也可作从属连词用。在近几年的高考试题中常常出现考查其从属连词用法的题目。其用法如下： 1.表示“在…..之前就…..”。 Mary had finished her homework before her mother returned. 2.表示“过了多久后才…….. ，动作进行到什么程度才……” They walked about 30 miles to the west before they saw a village . 3.表示“来不及；尚未…..就…” He ran off before I could stop him . 4.表示“刚…就…” I had hardly sat down before the bell rang. 5.表示“不知不觉就…..；还没弄清就……” Time passed quickly and three months went by before Aqiao knew it. 6.表示“宁愿…，决不…，与其…，毋宁….”常与will 或would 连用。 I would / will die before I surrender . 7.表示“否则；以免” I will write it down before I forget it . 8.用于句型“it was+时间段+ before …” 表示“过了多久才…” It was three days before he came back. . 9.用于句型“ it was not long +时间段+ before …” 意为“不久就….” It was not long before he sensed the danger of the position . 10. 用于句型“it will be(not )+时间段+ before….”表示“要过多久/ 不久…才…” It will be half a year before you graduate from this school .
用作动词(v.) keep about〔around〕1( v.+adv. ) 1. 继续履行职责go on with one's duties keep about〔around〕 She is very ill, but she still keeps about. 她虽然病得很重,但仍然继续工作。 2. 使手边常有have sth always present keep sth ? about〔around〕 I like to keep a few envelopes around in case I need them.我喜欢手边常有几个信封,以应不时之需。 keep about〔around〕2 ( v.+prep. ) keep abreast of( v.+adv.+prep. ) keep after( v.+prep. ) keep aloof( v.+adv. )
keep apart( v.+adv. ) keep at( v.+prep. ) keep away( v.+adv. ) keep away from( v.+adv.+prep. ) keep back( v.+adv. ) keep behind1( v.+adv. ) keep behind2 ( v.+prep. ) keep by1( v.+adv. ) keep by2( v.+prep. ) keep down( v.+adv. ) keep for( v.+prep. ) keep from( v.+prep. ) keep going( v.+adj. ) keep in1( v.+adv. ) keep in2( v.+prep. )
英语比较级的用法 一忌使用双重比较级 即构成比较级时不能既加词尾-er，又在其前加more。如： 他的英语比我的英语好多了。 误：His English is more better than mine. 正：His English is much better than mine. 【注】虽不能说more better, most earliest 之类的，但可用“比较级+and+比较级”这样的形式： It’s getting warmer and warmer. 天气变得越来越暖和。 I’m getting fatter and fatter. 我越来越胖了。 We’re going more and more slowly. 我们越走越慢了。 要想加强比较级的语气，可用much, far, even, still, rather等修饰。如： This is very much cheaper. 这个便宜得多。 This one is even more expensive. 这个更贵些。 The patient is much better now. 病人现在好多了。 二忌比较对象不一致 如果有人问你“一公斤苹果多还是一尺布多”时，你会怎么回答？你肯定认为无法回答。对，无法回答，因为它们“单位”不一样，或者说它们不是同一类型的两个比较对象。在使用英语的比较级时，也要特别注意不要“比”错了对象。如： Her French was no better than mine. 她的法语比我好不了多少。 My dictionary is more useful than yours. 我的词典对你的词典更有用。 All your neighbours are noisier than ours. 你们的所有邻居都比我们的吵闹。
Keep 用法知多少 keep 是英语中用法灵活的动词之一，用法归纳如下： 一、用作系动词，意为“保持（某种状态）”，其后常接形容词作表语。如： Please keep quiet / silent! 请保持安静！ After the accident, he still kept alive. 这次事故之后，他仍然活着。 二、用作实义动词，可表示： 1. 保管；保存；保留。如： Keep the change. 零钱不用找了。 Please keep these things for me while I am away. 在我离开期间，请你替我保管这些东西。 2. 赡养；饲养。如： Does he earn enough to keep himself and his family? 他的收入够养活他自己和他的家人吗？ I used to keep sheep in my childhood. 我在孩提时常常养羊。 3. 经营。如： Her father kept a grocer's shop for a number of years. 她父亲开了几年杂货店。 4. 坚持；继续。后面如接动词，要用V-ing 形式作宾语。如： If you keep (on) practising your spoken English, you'll soon make great progress. 如果你坚持练习英语口语，你很快就会取得很大的进步。 5. 阻止；阻碍。常用于keep sb/sth from doing sth 结构中，其中介词from 不能省略。如： The heavy rain didn't keep them from watching the football match. 大雨没能阻止他们观看足球赛。 6. 保持。其后常接复合宾语，表示使（某人或某物）保持某种状态或使某一动作继续。 ①keep + sb/sth + 介词。如：
before的用法 1．表示“在……之前”。说明两个时间或两个事件之间的先后关系。 1)They had got everything ready before I arrived．在我到达之前他们已经把一切都准备好了。 2)She didn’t understand me before I explained it to her．在我向她解释之前，她不理解我的意思。 3)The train had left before I arrived at the station．在我到达车站之前火车已开走了。2．表示“……才…… ”，强调从句的谓语动词所表达的时间、距离很长或花费的力量比较大。 1)The workers worked long hours for two weeks before everything returned to normal．工人们长时间地工作了两周，一切才恢复正常。 2)The big fire lasted four hours before the firemen brought it under contro1．大火持续了四个小时，消防队员才把它控制住。 3) We waited a long time before the train arrived．我们等了很长时间火车才到。 3．表示“还未来得及……就……”，强调主句谓语动词所表达的时间、距离很短或花费的精力比较小。 1)Before I could figure out what had happened，he forced me into the car．我还不知道发生了什么，他就强行把我推进了汽车。 2)He jumped into the water before I could stop him．我还没有来得及阻止他，他就跳进了水里。 3)Her father died before she was born．她尚未出世父亲就去世了。 4．表示“趁着……”。 1)We can set off early before it gets hot．我们可以趁着天不热早点出发。 2)You’d better write the phrases down before you forget them．趁着你还没有忘记，赶紧把这些词组写下来。 3)Please put them away before they are missing．趁着他们还没有丢，把它们收好吧。5．表示“一……就”、“刚刚……就”。与hardly．scarcely连用o 1)He had hardly gone to bed before(=when)the door bell rang．他刚刚睡下，门铃就响了。 2)She had scarcely got off the train before(=when)her daughter ran towards her．她刚一下车，女儿就跑了过来。 6．表示“不知不觉多少时间已经过去了”。 1)He was so absorbed in his work that four hours had passed before he knew it．他如此专注于工作，不知不觉四个小时就过去了。 2)Time passed quickly and three months went by before he knew it．时间飞快地流逝，他没感觉到三个月已过去了。 7．表示“宁可,宁愿”，相当于rather than。 1)I’d die b efore I apologized to them．我宁死也不向他们道歉。 2)1 would be poor before I got money in this way．我宁愿穷也不愿用这种方式挣钱。8．before常用于句型 “it was +段时间+before……”“过了(多长时间)才…… ”; “it will be……before…… ”“要用(多长时间)才……”; “it wasn’t……before……”“没过(多长时间)就……”; “it won’t be……before……”“用不了(多长时间)就会……”。 1)It was long before he came to help me．过了很久他才来帮我。 2)It wasn’t long before the fire was put out．不久火就给扑灭了。
Before的用法 一、用作介词 ⒈)指时间上早于，在……之前，如： We finished the work before noon. 中午以前我们完成了工作. ⒉)指位置在前面，如： We knelt down before Grandma's grave. 我们在奶奶的墓前跪下。 ⒊)指顺序或排列在之前，如： Your name comes before mine on the list. 名单上你的名字在我之前。 ⒋)在某人面前，如： She said it before the witness. 他是当着证人的面说的。 二、用作连词 其基本含义是“在……之前”，又可以根据不同语境灵活翻译成“才”、“还没来得及就……”、“趁……”、“就”等。具体用法如下： ⒈)与情态动词can/could连用 这时候从句虽为肯定形式，根据汉语表达习惯译成“还没来得及就”，如： Before I could get in a word，he had measured me. 我还没来得及插话他就为我量好了尺寸。Before she could move, she heard a loud noise, which grew to a terrible roar. 她还没来得及迈步，就听见一声巨响，接着就是可怕的隆隆轰鸣。 →The roof fell before he had time to dash into the room to save his baby. 他还没有来得及冲进房间救孩子，房顶就塌了。 ⒉)用于肯定句中强调主句所表达的时间，距离长，或花费的精力大，译成“才” We had sailed four days and four nights before we saw lands. 我们航行了四天四夜才看到陆地。 We waited a long time before the train arrived. 我们等了很长时间火车才到。 ⒊)用于否定句中，强调主句所表达的时间，距离短，或花费的精力小，译成“不到……就”如： We hadn't run a mile before he felt tired. 我们跑了还不到一英里他就累了。 ⒋)主句含有scarcely等半否定副词时可以译为“刚……就”，这时候主句应用过去完成时态，从句用过去时，还可以用when替代before如： We had scarcely reached the school before/when the bell rang. 我们刚到学校铃声就响了。 ⒌)有时还有“宁愿”的意思 I'd shoot myself before I apologized to him. 我宁死也不向他道歉。 ⒍)用于It+ be/takes+时间段+before句型 在这一句型中又可以根据主从句的时态分成两种情况。 若主句是一般将来时态，从句是一般现在时。若主句是肯定句意思是“要过多长时间才”；若主句是否定形式则翻译成“用不了多久就”。 It will be two weeks before everything returns to normal. 两周之后一切才能恢复正常。 It will be many years before the situation improves. 这种状况或许要过许多年才能得以改善。It won't be long before we meet again. 用不了多久我们就会再见面的。 这时若主句是一般过去时，从句也是一般过去时。若主句是肯定句翻译成“过了多久才……”或“动作进行到什么程度才……”，若主句是否定形式翻译成“没过多久就”。如：
Keep用法归纳 在人教版初中英语教材中，keep是要求学生必须掌握的四会词之一，现将其多见用法归纳小结如下，以利于大家正确地使用该词。 一、用作及物动词 1.意为“保存；保留；保持；保守“。如： Could you keep these letters for me, please?你能替我保存这些信吗？ I“ll keep a seat for you.我给你留个座位。 It can help to keep vegetables, fruit and meat for a long time in hot summer.在炎夏的夏天，它有助于蔬菜、水果和肉类长时间保鲜。 Can you keep a secret?你能保守秘密吗？ 2.意为“照顾；养活“等。如： She kept her sister for a week while her sister was ill.她妹妹有病时，她照看她了一个星期。 I have a family to keep.我得养活一家人。 3.意为“留下；不必还“。如： You can keep the pen if you like it.你要是喜欢就把钢笔留下吧。 Keep the change.不用找零钱了。 4.意为“遵守；维护“。如： Everyone must keep the rules.人人必须遵守规章制度。 The teacher is keeping order in class.老师正在课堂上维持秩序。 5.意为“售；卖“。如： The shop keeps everything you need.那家商店里出售的东西应有尽有。
1．表示“在……之前”.说明两个时间或两个事件之间的先后关系. 1)They had got everything ready before I arrived． 在我到达之前他们已经把一切都准备好了. 2)She didn’t understand me before I explained it to her． 在我向她解释之前,她不理解我的意思. 3)The train had left before I arrived at the station． 在我到达车站之前火车已开走了. 2．表示“……才……”,强调从句的谓语动词所表达的时间、距离很长或花费的力量比较大. 1)The workers worked long hours for two weeks before everything returned to normal．工人们长时间地工作了两周,一切才恢复正常. 2)The big fire lasted four hours before the firemen brought it under contro1．大火持续了四个小时,消防队员才把它控制住. 3) We waited a long time before the train arrived．我们等了很长时间 火车才到. 3．表示“还未来得及……就……”,强调主句谓语动词所表达的时间、距离很短或花费的精力比较小. 1)Before I could figure out what had happened, he forced me into the car．我还不知道发生了什么,他就强行把我推进了汽车. 2)He jumped into the water before I could stop him． 我还没有来得及阻止他,他就跳进了水里. 3)Her father died before she was born．她尚未出世父亲就去世了. 4．表示“趁着……”. 1)We can set off early before it gets hot． 我们可以趁着天不热早点出发. 2)You’d better write the phrases down before you forget them． 趁着你还没有忘记,赶紧把这些词组写下来. 3)Please put them away before they are missing． 趁着他们还没有丢,把它们收好吧. 5．表示“一……就”、“刚刚……就”.与hardly．scarcely连用 1)He hadhardly gone to bed before(=when)the door bell rang． 他刚刚睡下,门铃就响了. 2）She had scarcely got off the train before(=when)her daughter ran towards her．她刚一下车,女儿就跑了过来. 6．表示“不知不觉多少时间已经过去了”. 1)He was so absorbed in his work that four hours had passed before he
?keep at 1.坚持做…：继续某项工作或行为 ?keep down 1.压制，镇压：阻止…成长、完成或成功 Keep down prices; keep the revolutionaries down. 控制物价；镇压革命 ?keep off 躲开，避开 ?keep to 1.坚持，信守Keep to the original purpose.遵守原定宗旨 ?keep up 1.保持良好状态Kept up the property保存财产 2.保持；继续We asked her to stop talking, but she kept up. 我们请她别再说话了，但她依旧说下去 3.并行：按相同的水平或步伐继续下去 4.不落后，赶得上：赶上对手、同事或邻居，指在成就或生活方式上 Unsuccessfully tried to keep up with his associates.没能赶上他的同事们 ?you can't keep a good man (或woman) down (非正式)有能力的人是不会被挫折或问题吓倒 ?keep one's feet 站稳，不倒 ?keep goal (主英足)守球门 ?keep going (困难时）努力维持正常生活 ?keep open house 好客 ?keep to oneself 避开与人接触，独处 ?keep something to oneself 守口如瓶 ?keep up with the Joneses 与人攀比 ?keep wicket (板球)守板球门 ?keep someone after (美)（作为对小学生的惩罚）放学后留校
“the more…,the more…”的用法 (1)“the more…,the more…”句型为“the+形容词或副词比较级,the+比较级”结构,常表示“越……,就越……”,是一个复合句,其中前面的句子是状语从句,后面的句子是主句。 The more he gets,the more he wants.他越来越贪(他得到的越多,就越想要)。 The more she learns, the more she wants to learn.她越学就越想学。 (2)“the+比较级,the+比较级”句型主从句的时态常用一般现在时或 一般过去时。 The higher the ground is, the thinner the air becomes.离地面越高,空气就越稀薄。 The harder he worked, the more he got.他工作越努力,得到的就越多。 (3)若主句的谓语动词用一般将来时,从句的谓语动词要用一般现在时表示将来。 The harder you work, the greater progress you will make.你越用功,进步就越大。 The longer the war lasts, the more the people there will suffer.战 争持续越久,那里的人们受难就越多。 (4)在这种句型中,主句在程度上随着从句变化而变化,常把被强调的部分提前。
The faster you run, the better it will be. 你跑得越快越好。 (5)这种句型的特点是前后都可以有所省略,特别是谚语、俗语,只要意义明确,越简单越好。 The more, the better. 多多益善。 The sooner, the better. 越早越好。 (6)这种句型中的比较部分通常是状语、宾语、表语,也可以是主语。The more English you practice, the better your English is. 你练习英语越多,你的英语就越好。 The busier he is, the happier he feels. 他越忙越高兴。 The more air there is inside the tyre, the greater the pressure there is in it. 轮胎里空气越多,里面的压力就越大。 (7)若表示“越……,越不……”,常用“the more…,the less…”句型。 The more she flatters me, the less Ilike her.她越逢迎我,我越不喜欢她。 (8)若表示“越不……,就越……”,常用“the less…,the more…”句型。The less he worried, the better he worked. 他越不烦恼,工作就干得越 好。
Before的详细用法总结 今天给大家带来Before的用法，我们一起来学习吧，下面就和大家分享，来欣赏一下吧。 Before的用法 我们最初接触的Before一般是作为介词使用的，一般表示空间上的“在…之前” 。 例如：The tea has been set before her.茶已经摆在她面前了。 Before作为介词时，需要注意的是，一般不用在表示具体时间的词之前。比如，两年之前，我们用two years ago，而不能说.efore two years. Before作为介词时，有一个特殊用法需要注意，即before long 表示“不久之后”。 例如：Before long he got married.不久之后他就结婚了。 Before作为连词时，一般意为“在…之前”，用来引导时间状语从句。引导的从句中的动作一般发生在主句动作之后。 Before作为连词时的用法较为复杂，具体要点如下：
一、主句用一般现在时/一般将来时,从句用一般现在时。 例如：You should let me explain what I did before you criticize me. 在你批评我之前，你应该让我解释一下我做过什么。 二、主句用过去完成时,从句用一般过去时。一般翻译为“在…之前就… ”。 例如：1.His father had died before he was born. 他父亲在他出生之前就已经去世了。 2.She had finished her homework before her mother returned. 她在妈妈返回之前就已经把作业完成了。 三、主句用一般过去时,从句用过去完成时。从句用过去完成时表示一个过去没有完成或没来得及做的、时间顺序在后的动作，常译为“★还没（来得及）…就…★ ”。 例如：1.He rushed out of the office before I had realized what was happening. 我还没意识到发生了什么事，他就冲出去了。 2.She left before I had had a chance to speak to her. 我还没来得及跟她说话，她就离开了。
before的用法是很多的人都比较想要了解的，在众人的心中before的用法是比较难的，我们都非常想要去了解before的用法，但是又谈何容易呢?为了让大家更加快速的了解before的用法，下面我们就和教师一起去看看吧，希望对大家有所帮助。 prep.在……之前;先于，优于;当着……的面;与其…… conj.在……之前;在……以前;比……早些;与其…… adv.先前，从前;在前，在前方 before一词含义广泛，是高考考查的热点词汇之一，但部分考生对该词的用法模糊不清。为了帮助大家掌握，现就对before的用法归纳如下： 一、before用作连词 1. before用作连词时，意思是“在……之前;还没来得及…… 就”。强调主句或从句谓语动词表示的动作发生得过早或过快?例如： Before she could move, she heard a great noise, which grew to a terrible roar. 她还没来得及动弹，就听见有很响的声音，接着就成了可怕的隆隆轰鸣声。 Before I could say a word, she had stormed out of the room. 不等我说一句话，她就冲出了房间。 Don’t count your chickens before they are hatched. 不要高兴得过早。 I must finish my homework before I watch TV.我必须做完作业才能看电视。 It still took seven years before they finally got married. 过了七年他们才最终得以成婚。 It will be only a few minutes before she comes back. 她过几分钟就会回来。 He announced the ending of the meeting before I could get in a word. 没容得我插上一句话,他就宣布散会了? Someone called me up in the middle of the night, but they hung up before I could answer the phone.有人半夜给我打电话,但我还未来得及接他就把电话挂断了? They had talked only a few minutes before they found they were quite different in opinion.他们才谈了几分钟就发现他们的意见很不一致? 注意：before从句若是一个将来的动作，则用一般现在时代替一般将来时，如上句中的comes。 2. 用于It + be + 时间段+ before...句型中，意思是“在……之后才……”。例