before的用法，
一、可以用作介词
⒈)指时间上早于，在……之前，如：
She has lived here since before the war. 她从战前就一直在这儿住。
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、作为连词
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。
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hardly，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。
I'd die before I'd tell. 我宁死也决不会说出来。
否则,要不然
Get out before I call the police. 滚开,否
则我叫警察。
⒍)用于It+be/take+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。
若主句是一般时将来时态，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“多长时间之后才”，若主句是否定形式翻译成“没过多久就”。如：
It was some time before I realized the truth.
过了很长一段时间我才了解到真相。
It wasn?t long before she became a brave solider.
没过多久她就成了一名勇敢的战士。
After that it still took seven years before they got married.
他们又过了七年才结婚。
注意：当主句的谓语动词为延续性动词时，before与until有时可以互换。It was an hour before/until the police arrived.
■巩固练习
⒈(2004天津)It was evening ________ we reached the little town of Winchester.
Athat B.until C.since D.before
2.(2004全国)Several weeks had gone by ________we realized the painting was missing.
A.as
B.before
C.since
D.when
3.(2005广东)The America Civil War lasted four years ______ the North won in the end.
A.after
B.before
C.when
D.then
4.(2005山东)It was some time _______ we realized the truth.
A.when
B.until
C.since
D.before
5.(2006四川)-Why didn?t you tell him about the meeting？
-He rushed out of the classroom _______ I could say a word.
A.before
B.until
C.when
D.after
6.(2006福建)-How long do you think it will be __ china sends a manned spaceship to the moon？
-Perhaps two or three years.
Awhen B.until C.that D.before
参考答案：DBBDAD
英语情态动词用法总结(完整) 一、单项选择情态动词 1．--- Difficulties always go with me! --- Cheer up! If God closes door in front of you, there be a window opened for you. A．must B．would C．could D．can 【答案】A 【解析】 【详解】 考查情态动词辨析。句意：——困难总是伴随着我！——高兴点! 如果上帝在你面前关上了门，一定有一扇窗户为你打开。A. must必须；B. would将要；C. could能，会；D. can能，会。must表示对现在的状态推测时，意为“一定”，表示可能性很大的推测。符合语境。故选A。 【点睛】 1) must用在肯定句中表示较有把握的推测，意为"一定"。 2) must表对现在的状态或现在正发生的事情的推测时， must 后面通常接系动词be 的原形或行为动词的进行式。 3) must 表示对已发生的事情的推测时，must 要接完成式。 4) must表示对过去某时正发生的事情的推测，must 后面要接完成进行式。 5) 否定推测用can't。 本句中的。must表示对现在的状态推测时，意为一定，表示可能性很大的推测。符合第2点用法。 2．Paul did a great job in the speech contest. He many times last week. A．need have practised B．might practise C．must have practised D．could practise 【答案】C 【解析】 【详解】 考查情态动词。句意：保罗在演讲比赛中表现得很好。他上星期一定练习了很多次。must have done是对过去发生的动作最有把握的猜测，意思是“一定”。故C选项正确。 3．He is a bad-tempered fellow, but he ________ be quite charming when he wishes. A．shall B．should C．can D．must 【答案】C 【解析】 【详解】 考查情态动词辨析。句意：他是个脾气不好的家伙，但当他希望自己有魅力的时候，他可
习题精选---分词用法: boy went to the ball,＿like a pretty girl. A. dressing B. wearing C. wore D. dressed 2.＿in a white uniform, he looks more like a cook than a doctor. A. Dressed B. To dress C. Dressing D. Having dressed 3. The film was made＿on a true old story. A. base B. to be based C. based D. basing 4. When＿,the museum will be open to the public next year. A. completed B. completing C. being completed D. to be completed 5.＿to his research, he almost forgot everything. A. Devoting B. Devoted C. To devote D. Devote 6. ＿his attention on his novel, he didn’t notice the teacher coming. A. Fixed B. Fixing C. Fix D. To fix 7.＿on his novel, he didn’t notice the teacher coming. A. Fixed B. Fixing C. Fix D. To fix old engineer talked of the difficulty they ＿the tower. A. built B. had building C. had built D. build 9. ＿such heavy pollution already, it may now be too late to clean up the river. A. Having suffered B. Suffering C. To suffer D. Suffered 10.＿the past, our life is becoming much better. A. Comparing with B. Be compared with C. To compare with D. Compared with 11. The boy was last seen ＿near the East Lake. A. playing B. play C. played D. to play was very unhappy for ＿to the party. A. having not been invited B. not having invited C. having not invited D. not having been invited I got back home I saw a message pinned to the door ＿“Sorry to miss you; will call later.” A. read B. reads C. reading D. to read 14. We went to see him yesterday evening, ＿him away. A. finding B. find C. only to find D. found 15. ＿of plastics, the machines are easy to carry. A. To make B. Having made C. Being made D. Made Suggested answers: 1-5 DACA B 6-10 BABAD 11-15 ADCCD
高中英语时态语态讲解 1、一般现在时主要用来表示人、事物的现在状况和特点；表示经常或习惯性的动作；表示客观规律和永恒真理；按照计划安排好了将要发生的动作（一般指时 刻表）等 He usually goes to w ork at 7 o’clock every morning. The train to Shanghai leaves at 7am. 考点一：表示永恒的真理，即使出现在过去的语境中，仍用一般现在时。如：I learned that the earth goes around the sun when I was in primary school. 考点二：在时间、方式、让步和条件状语从句中，代替一般将来时；常用的引导词有：时间：when, until, after, before, as soon as, once, the moment/the minute, the day; 条件：if, unless, provided. If he accepts the job, he will get more money soon. 只要他努力工作，我不介意他什么时候做完试验。 2、现在进行时 表说话时或目前一段时间内正在进行的活动；或表感情色彩，加强语气。与频率副词，如always，constantly，continually，again等连用表示说话人的某种感情色彩（赞叹、厌烦、埋怨等）。 We are having English class. The house is being built these days. The little boy is always making trouble. 考点一：在时间状语或条件状语从句中表示将来正在进行的动作。Look out when you are crossing the street. Don't wake him up if he is still sleeping at 7 tomorrow morning. 考点二：表示在最近按计划或安排要进行的动作（这时多有表示将来的时间状语）。 Marry is leaving on Friday. 3、现在完成时 （1）非延续动作：动作发生在过去，对现在有影响。（2）延续性动作：动作和状态的持续。现在完成时有一些标志性的时间状语： 考点一：for + 时间段；since + 时间点 They have lived in Beijing for five years. They have lived in Beijing since 1995. 考点二：常见的不确定的时间状语：lately; recently, just, already, yet, up to now; till now; so far, these days, Has it stopped raining yet ? 考点三：在表示“最近几世纪/ 年/ 月以来……”时间状语中，谓语动词用现在完成时。 in the past；over the past; during the last等 考点四：表示“第几次做某事，”或在“It is the best (worst, most interesting ) +名词＋that” 后面,主句是一般现在时态时，从句用现在完成时。 This is my first time that I have visited China. This is the most interesting film I have ever seen. 4．一般过去时 表在过去某个特定时间发生且完成的动作，或过去习惯性动作，不强调对现在的影响，只说明过去。常跟明确的过去时间连用, 注意： 考点一：used to + do，表示过去经常但现在已不再维持的习惯动作。 be/become/get used to + doing，表示习惯于 He used to smoke a lot. He has got used to getting up early. 考点二：在时间和条件状语从句中，代替过去将来时。 He promised to buy me a computer if he got a raise 5. 过去进行时
英语情态动词用法详解 一、单项选择情态动词 1．Look! There are so many mistakes in your composition. You ________ have fixed full attention on it. A．can B．should C．need D．might 【答案】B 【解析】 【详解】 考查情态动词。句意：看！你的作文里有那么多的错误。你本应该把所有的注意力都集中在它上面的。表示“本应该做但实际上没有做”应该用should have done结构，can have done 表示可能；need表示需要；might have done表示可能做过某事；故选B。 2．---Hi, Johnson, any idea where Susan is? ---It is class time, so she __________ in the classroom now. A．can be B．must have been C．might have been D．should be 【答案】D 【解析】 考查情态动词的用法。A. can be可能，可以是；B. must have been一定（对过去事实肯定的推测）；C. might have been可能（对过去事实肯定的推测）；D. should be应该是。句意：—知道苏珊在哪里吗？—现在是上课时间，她应该在教室里。故答案选D。 3．The room is so clean. He ________ have cleaned it yesterday evening. A．will B．need C．can D．must 【答案】D 【解析】 【详解】 考查情态动词表推测。句意：房间如此干净，他一定是昨天晚上打扫过了。must have done 表示对过去发生的事情有把握的猜测，意思是“一定（做过）”，故D项正确。 4．— Excuse me, do you mind if I open the window? — Well, if you __________. I can put on more clothes. A．can B．may C．must D．shall 【答案】C 【解析】
动词的时态和语态用法详解 在英语中，不同时间里发生的动作或存在的状态需要用动词的不同形式表示出来，动词的这种不同 形式就构成了动词的时态。 英语中的时态按动作发生时间分为现在时态、过去时态、将来时态 二、常见时态的基本用法 1. 一般现在时：一般现在时是描述现在或经常性的动作性质或状态的时态。常和表示频率、时间的副词 （短语） always, every time, now and the n, occasi on ally, often, seldom, sometimes, usually 连用。 1） 表示经常性或习惯性的动作。 We have three meals a day. 2） 表示客观事实、真理和自然现象。 Kno wledge is power. 3）表示现在的情况或状态。 I live in Beiji ng. 4）表示已经“列入日程”的将来的事件，尤其指计划中的和安排好的将来的动作，这些动词往往表示“出 发，到达”等含义 的词， 女口， arrive, begin, go, leave, start, stay 等。 The train arrives at 10:30. There's ple nty of time. 。 考点一：表示永恒的真理，即使出现在过去的语境中，仍用一般现在时。 如: I learned that the earth goes around the sun when I was in primary school. 考点二：在时间和条件状语从句中，代替一般将来时；常用的引导词有：时间：when, until, after, before, as soon as, on ce, the mome nt/the minu te, the day; 条件：if, uni ess, provided. If he accepts the job, he will get more money soon. 考点三：在 make sure (certain), see to it, mind, care, matter 替一般将来时。 So long as he works hard, I don ' t mind when he finish 考点四：在 the more …the more …(越 ..................... 越 ... )句型中 在时。 The harder you study, the better results you will get. 2. 一般过去时：一般过去时表示过去发生的动作、存在的状态，或反复发生的动作，句中一般都有表示 过去具体时间的时间 状语。 1）在确定的过去时间里所发生的动作或状态。 此时与表示过去的时间状语连用， 如yesterday, last week, an hour ago, the other day, in 1998 等。 +宾语从句，从句用一般现在时代 es the experime nt. ,若主句是一般将来时，从句通常用一般现
高中英语过去分词用法 练习题及答案 IMB standardization office【IMB 5AB- IMBK 08- IMB 2C】
习题精选---分词用法: boy went to the ball,＿like a pretty girl. A. dressing B. wearing C. wore D. dressed 2.＿in a white uniform, he looks more like a cook than a doctor. A. Dressed B. To dress C. Dressing D. Having dressed 3. The film was made＿ on a true old story. A. base B. to be based C. based D. basing 4. When＿ ,the museum will be open to the public next year. A. completed B. completing C. being completed D. to be completed 5.＿ to his research, he almost forgot everything. A. Devoting B. Devoted C. To devote D. Devote 6. ＿his attention on his novel, he didn’t notice the teacher coming. A. Fixed B. Fixing C. Fix D. To fix 7.＿ on his novel, he didn’t notice the teacher coming. A. Fixed B. Fixing C. Fix D. To fix old engineer talked of the difficulty they ＿ the tower. A. built B. had building C. had built D. build 9. ＿such heavy pollution already, it may now be too late to clean up the river. A. Having suffered B. Suffering C. To suffer D. Suffered 10.＿ the past, our life is becoming much better. A. Comparing with B. Be compared with C. To compare with D. Compared with 11. The boy was last seen ＿near the East Lake. A. playing B. play C. played D. to play was very unhappy for ＿to the party. A. having not been invited B. not having invited C. having not invited D. not having been invited I got back home I saw a message pinned to the door ＿“Sorry to miss you; will call later.” A. read B. reads C. reading D. to read
英语情态动词的常用用法归纳 1概念 在英语的动词当中，凡是用来刻画人的情感动作的动词，我们称之为情态动词，情态动词有着具体的汉语意思。但却不能独立作谓语和后面的行为动词一起构成和成谓语。区别于其他的行为动词，情态动词没有人称和数的变化，有少数的时态现象——一般时、过去时、将来时等。 2应用 一.Can 1、can表示说话人的能力，常译作能、能够、会。 eg：I can speak English very well. Can you swim across the river? Yes, I can/ No, I can’t. 2、can可以用来表示说话人的客观可能性，通常应用于否定疑问句式中。 eg：People can’t live without water. Can you finish the jobs in three hours? Can this be true. 3、在口语里，can表示允诺、允许、可以。等于may，但是may的语气
重于can。 eg：Can I come in? = May I come in? Can I use your bike? = May I use your bike ? *表示允许可以may mightcould can 4、在“过去时”的语境里，通常用could 表示它的过去式，用be able to 短语（was/were） 而could通常用来在一般现在时的语境里表示委婉语气 eg：Could（can）you show me the way to the supermarket? 5、can表示猜测 （1）对现在状态的一种猜测，只能用在否定疑问句中。 eg：Zhang can’t be ill really? This can’t be done by him. （2）对现在动作的猜测 eg: The boy can’t be telling lies. Mary works so hard, now, she can’t be sleeping.
高中英语现在分词的用法 1）- ing分词（短语）作主语： 1. 动词-ing 形式作主语表示抽象的或泛指的动作, 谓语动词用单数。如： 1. Talking to him is talking to a wall. 对他说话等于对牛弹琴。 2. Smoking may cause cancer. 吸烟会致癌。 3. Walking is my only exercise. 散步是我唯一的运动。 4. Talking mends no holes. （谚）空谈无济于事。 5. Saying is easier than doing. 说比做容易。 1. 为了保持句子平衡，通常用作形式主语，而把真实主语放在句末。如：It is no use crying over spilt milk. 作无益的后悔是没有用的。 It's a waste of time arguing about it. 辩论这事是浪费时间。 常见的作表语的名词或短语有：no use, no good, fun, hard work, a hard / difficult job, a wonder, a waste of time 等。如： It is worthwhile discussing with her. It 's no good waiting here. Let 's go home. It was a waste of time reading that book. 2. 动词-ing形式的否定形式是在其前面加not。如： Your schoolmate 's not coming home made her parents worried. 2）-ing 分词（短语）作宾语： 1. I suggest ending the meeting. 我建议结束会议。 2. He admitted taking the money. 他承认钱是他拿的 3. I couldn ' t help laughing.
高中英语情态动词用法归纳与练习 A: can / could = be able to 1 表示能力两种时态can (could)，其他时态要用be able to的形式 He can speak French. Was/were able to 可以表示成功做成某事的含义* managed to do / succeeded i n doing With our help, he was able to build the house. 2 表示请求或许可Could 比Can 更加客气* may Can I go now? Yes, you can. 3 表示推测或可能性，常用于否定句和疑问句 Can he be at school? Today is Sunday. He can't be at school. Can’t couldn’t/ Can ? Could? have done There is no light in the room. Can she have gone to bed? She can’t have gone to school----- it’s Sunda y. Could have done 可用在肯定句中表示过去存在的可能性* may have done She could have gone out with some friends yesterday. Could have done 可以表示虚拟语气 某事可能发生（并没有发生） It was silly to throw the TV out of the window. It could have hit somebody. 批评某人没有完成某事(本可以做某事) You are late again. You could have got up earlier. 4 can 表示客观上的可能性* Anybody can make mistakes. B: may and might 1 表示请求和允许类似用法can could(更加口语化) May I watch TV now? Yes, you may. 2 表示可能性; 猜测might比may更加不确定may/might have done 对过去的揣测* He may be busy these days. May not 可能不；不可能；一定不可 3 表示祝愿Wish you success! May you succeed!* C: must and have to 1 表示必须；一定要可以用have to 代替 must 现在；将来的必须而且是主观看法* have to 有多种时态而且强调客观情况 I really must stop smoking now. I had to leave early because I wasn’t feeling well. Must I come here?
高中现在分词用法练 时间：20150529 一 1. (make) full preparations, we are ready for the examination. 我们已经作好了充分准备，现在可以应考了。 (= After we have made full preparations...) 2. (be) ill, he didn't go to school yesterday. 由于生病，他昨天没有上学。 (= Because he was ill...) 3.His father died, (leave) him a lot of money. 他父亲死了，留给他许多钱. (= and left him a lot of money.) 4.He lay on the grass, (stare)at the sky for a long time. 他躺在草地上，长时间地望着天空。 (= ...and stared at the sky for a long time) 5. (work) hard at your lessons, you will succeed. 如果你努力学习，就一定能成功。 (=If you work hard at your lessons.) 6. (know)all this, they made me pay for the damage. 尽管知道了一切情况，他们还是要我赔偿损失。 (= Although they knew all this.)Rewrite the following sentences. 7. When he approached Ms Smith, he touched her shoulder and kissed her. ________________ Ms Smith, he touched her shoulder and kissed her. 8. The person who is translating the songs can speak seven languages. The person _________ ___ ______can speak seven languages. 9. Because he comes from Jordan, he moves close to ask you a question. _______ _____ Jordan, he moves close to ask you a question. 10. She sat at the desk and did her homework. She sat at the desk ______ ____ __________. 11. The picture that hangs on the wall is a world-famous one. The picture _______ on the wall is a world-famous one. 12. Because he di dn’t receive an answer, he decided to write another letter to him. ____ ____________ an answer, he decided to write another letter to him. 13. When he sees the mountain, he always thinks of his hometown. _______ the mountain, he always thinks of his hometown.
1、一般现在时主要用来表示人、事物的现在状况和特点；表示经常或习惯性的动作，句子中常有often, always, from time to time 等时间状语；表示客观规律和永恒真理等。He usually goes to w ork at 7 o’clock every morning. The earth goes around the sun. Guangzhou is situated in the south of China. 考点一：表示永恒的真理，即使出现在过去的语境中，仍用一般现在时。如：I learned that the earth goes around the sun when I was in primary school. 考点二：在时间和条件状语从句中，代替一般将来时；常用的引导词有：时间：when, until, after, before, as soon as, once, the moment/the minute, the day; 条件：if, unless, provided. If he accepts the job, he will get more money soon. 考点三：在make sure (certain), see to it, mind, care, matter ＋宾语从句，从句用一般现在时代替一般将来时。 So long as he works hard, I don’t mind when he finishes the experiment. 只要他努力工作，我不介意他什么时候做完试验。 考点四：在the more… the more … (越……越……) 句型中, 若主句是一般将来时, 从句通常用一般现在时。 The harder you study, the better results you will get. 2、现在进行时 表说话时或目前一段时间内正在进行的活动：或表感情色彩，加强语气。与频率副词，如always，constantly，continually，again等连用表示说话人的某种感情色彩（赞叹、厌烦、埋怨等）。
动词的-ing形式按功能可分为动名词和现在分词。动词的-ing形式何时为动名词，何时为现在分词。首先，我们要从概念上区分。动词的-ing形式在起名词作用时，称为动名词；用作形容词或副词时，称为现在分词。其次，我们要从用法方面区分动词的-ing形式是动名词还是现在分词。 一、动词的-ing形式用作主语时为动名词，现在分词不可以用作主语。 1．动名词用作主语. Reading French is easier than speaking it. 阅读法文比讲法语容易。 Talking to him is talking to a wall. 和他说话等于对牛弹琴。 2．有时it作形式主语，把动名词主语放在句子后面 It’s nice seeing you again. 再次见到你太好了。 It was tiring driving from morning till night. 从早到晚开车很累人。 3. “There is + no”后可以用动名词作主语 There was no knowing what he could do. 他能做什么很难说。There was no arguing with her. 没法和她争论。 二、动词的-ing形式用作宾语时为动名词，现在分词不可以用作宾语。 1．有许多动词可接动名词作宾语 I suggested bringing the meeting to an end. 我建议结束会议。 So you prefer living abroad? 这样说你更愿意住在国外？ 2．有许多带介词的动词固定搭配接动名词作宾语 He has given up playing football. 他现在不踢足球了。Prices keep on increasing. 价格不断上涨。 三、当动词的-ing形式用作状语时为现在分词，动名词不可以用作状语。 现在分词及其短语可以用作状语，表示时间、原因、结果、条件、让步、方式或伴随情况等。其动作可能发生在谓语之前或之后，也可能与谓语动词的动作同时发生。 Climbing to the top of the tower, we saw a magnificent view. 我们爬到塔顶后，看到了一片壮丽的景象。（表时间） Living in the country, we had few social engagements. 我们住在乡下，交际的机会很少。（表原因） Having money, he will buy a bigger car.（表条件） Knowing the secret, she would not tell me about it..（表让步） The child fell, striking his head against the door and cutting it. 那孩子跌倒了，头碰在门上碰破了.（表结果） He stood leaning against the wall. 他靠墙站着.（表方式或伴随情况） 四、动名词与现在分词都可以用作表语，当动词的-ing的作用相当于名词时为动名词。当动词的-ing的作用相当于形容词时，动词的-ing为现在分词。 1．动名词用作表语 Her hobby is painting. 她的爱好是绘画。Her job was tending the sheep. 她的工作是放羊。 2．现在分词用作表语
v1.0 可编辑可修改 时态语态 （一）时态 一般现在时表示:1.现在的经常性、习惯性动作 eg: I read English every morning. 2.客观真理、普遍公立、科学事实eg: The sun rises in the east. 3.现有的兴趣、爱好或能力eg: He likes playing football. 4.现存的性质、特征或状态eg: The situation is encouraging. 5.介绍故事剧情、新闻标题eg: Workers face tough times abroad. 6.按时刻表或按规定计划、安排将要放生的动作（常见动词如：come, go, leave, arrive, begin, start, takeoff, return, stop, open, close等）eg: The train leaves at 4:30 . 注意：here, there, now, then 等开头的倒装句要用一般现在时代替现在进行时。如： Look! Here comes the bus. 一般过去时表示:1.过去经常性、习惯性的动作或状态eg: He often cried when he was a boy. 2.过去某时的状态或动作 eg: I went to the bank just now. 3.用于 I didn’t know…或 I forgot…，表示实现不知道或不记得，但现在已经知道或记得的事情。eg: I didn’t know you were here. Sorry, I forgot to bring my book. 注意：表示过去经常发生的动作，也可以用“used to do…”和“ would do” 一般将来时表示：1.现在看来以后要发生的动作或存在的状态eg: Tom will come next week. 2.事物的固有属性或必然趋势eg: Oil will float in water. Fish will die without water. 3.对将来某个动作的安排、计划eg: He is going to speak on TV this evening. 注意：将来时常见表达形式：will/ shall do; be going to do; be to do; be about to do （此形式不能与时间状语连用） 现在进行时表示：1.此时此刻正在发生的动作eg: I’m studying English now. 2.现阶段正在发生的动作eg: We are building our socialism. 3.情况的暂时性eg: I don’t really work here. I am just helping until the secretary arrives. 4.与 always, forever, constantly, continually 连用，表示参上或厌恶等感情色彩，但并非强调动作正在进行eg: He is always helping others. She is always forgetting something. 5.按计划、安排近期发生的动作（只限于come, go, leave, arrive, start, move, sail, fly, travel, stay等动词）eg: A foreigner is coming to visit our school. I’m leaving for Beijing tomorrow. 注意：不宜用进行时的动作：感觉类： look, smell, feel, sound, taste, see, hear 情感类：like, love, prefer, admire, hate, fear 心态类：wish, hope, expect, want, need, believe, thin, understand, agree, know, remember, forget 所有类：have, contain, won, hold, belong to 过去进行时表示：1.过去某一时刻或阶段发生的动作eg: He was watching TV this time yesterday. 2.与 always, forever, constantly, continually 连用，表示赞赏或亚无等感情色彩eg: Comrade Lei Feng was always thinking of others never thinking of himself. 3.过去计划、安排好的将来动作（只限于 come, go, leave, arrive, start, move, sail, fly, travel, stay 等动词）eg: He said he was leaving the next day. I was told the train was starting soon. 注意：过去进行时可用来描绘故事发生的背景，如：The wind was blowing and it was raining hard. 过去将来时表示：1.过去某一时刻后将要发生的过去动作或过去的意图、打算（主要用于宾语从句中）eg: She was sure she would succeed. I thought you would come. 注意：把一般将来时中的助动词变成过去式，便成了过去将来时的表达形式 现在完成时表示：1.现在已完成或刚刚完成且对现在有影响的动作eg: I have finished my homework. 2.表示始于过去持续至今的动作或状态eg: He’s lived here since 2005. I’ve taught
高中英语情态动词的用法 一概述情态动词的共性 1) 情态动词一般直接加动词原形, 除ought + to do sth .在否定句或疑问句中to 可以省略 2) 情态动词不会因为主语的人称与数的变化而发生变化 3) 当情态动词表达与说话同时或说话之后的情况,直接加动词原形(do sth/be done) .在简略回答时直接用情态动词 (---Can you drive a car? ---- Yes, I can) (1)She said he might come to the farewell party (表达说话之后的情况) (2)She told me that he must be ill, for his face was pale(表达与说话同时情况) 4) 当情态动词表达说话时已发生的情况,加动词完成式( have pp/have been pp) 在简略回答时用情态动词+ have (---- Did he go to the cinema? ---- No, he should have, but he had to finish a report) (1) She may have been there yesterday (2) She should have come to his rescue when he was trapped in the elevator last night (3) He must have been praised at the meeting the other day 二情态动词用法 1 can 1)表示现在或将来的能力, 2)表示可能性“可能”