turn on的用法
1.打开;发动(水、电视、收音机、灯、煤气等）
Will you turn on the radio?
你打开收音机好吗?
2.(使)兴奋；感兴趣
Many young people are taking drugs to turn on..
许多年轻人吸毒寻求刺激。
His normally placid dog turned on him and bit him in the leg. 他那条狗平日很温顺，这次突然发作咬了他的腿。
turn用作名词时可以和不少介词构成介词短语，使用时须注意各短语意义上的细微差别。 l. at every turn每次，总是，到处，主要表示事情发生的频率。例如： ①Because of his drinking，the man was refused a job at every torn． 由于酗酒，那个人每次找工作都遭到拒绝。 ②Life holds new adventures al every torn． 生活中处处有新的风险。 2．by turn交替地，轮流地，一会儿……一会儿，其含义为：有规律地轮换，根据一个重复性的计划而一个接一个或一个替换另一个。通常位于句末．turn为复数。例如： ①His condition is critical；we have to look after him by toms． 他的病情极为严重，我们得轮流看护他。 ②When John had a fever，he felt cold and hot by turns． 约翰发烧时，他一会儿发冷，一会儿发热。 3．in one's turn轮到某人(做事)。例如： They，in their torn，rejected that． 轮到他们时，他们也拒绝了。 4．in turn依次地，一次一个地，轮流地，其含义为：按照一个固定的顺序依次进行。in turn 在句中位置较灵活，只有在表示“轮流”时才可和by turns换用，但它表示的时间范围要大些。in turn还可表示“回报”。例如： ①They rowed in turn／by toms． 他们轮流划船。 ②The children went on the bus in torn． 孩子们依次上了公共汽车。
at,in与on的用法 一、表示时间，注意以下用法： ①表示时间的某一点、某一时刻或年龄等用at。如： Igetupatsixinthemorning.我早上六点钟起床。 Hegotmarriedattheageof25.他25岁结婚。 ②泛指一般意义的上午、下午或晚上以及月或年等较长的时间，一般用in。如： WewatchTVintheevening.我们晚上看电视。 HewenttoJapanin1946.他于1946去了日本。 ③若表示星期几或某一特定的日期，则用on。如： HelefthereonthefifthofMay.他于5 月 5日离开这儿。 二、表示地点、场所、位置等，注意以下用法： ①表示某一点位置，用at。如： WeliveatNo87BeijingRoad.我们住在北京路87号。 Thehospitalisattheendofthestreet.医院在这条街的尽头。 与名词所有格连用表示地点，也用at。如： atmysister's在我姐姐家atthedoctor's在医务室 ②表示空间或范围，用in。如： What'sinthebox?这盒子里有什么? HelivesinPariswithhiswife.他同他妻子住在巴黎。 但有时两者可换用。如： Themeetingwasheldat[in]thehotel.会议在宾馆举行。 ③at与in的另一个区别是：at用于指较小的地方，而in用于指较大的地方。如： inShanghai在上海atthestation在车站 但是，大与小是相对的，有时随着说话者的着眼点不同，大地方也可能用at（比如把一个大地方看作一个点时）。如： OurplanerefuelledatLondon.我们的飞机在伦敦加油。 WestoppedforanhouratMoscowonourwaytoParis.我们在去巴黎的途中在莫斯科停了1个小时。 ④介词on用于地点，主要指在某物的表面。如： What'sonthetable?桌上有什么? There'sawalletlyingontheground.地上有个钱包。 【注】在少数搭配中，也用介词on。如： Heworksonafarm.他在农场工作。 三、在某些搭配中，三者的区别与英国英语和美国英语有关：
?Never be afraid of grammar ?Collect some examples; ?Watch them very carefully; ?Find out something in common; ?Try to use the rules ---- practise. it用法完全归纳 一、it 作人称代词的用法 1.指事物 作为人称代词，it 可以除人以外的一切事物或动物。如： I dropped my watch and it broke. 我把手表掉在地上摔坏了。 It’s hard work, but I enjoy it. 工作很辛苦，可是我乐意干。 “Where is the dog?”“It’s in the bedroom. ”“狗在哪?”“在卧室里”。 2.指人 it 指人主要用于指不性别不明的婴儿或用于确认某人的身份。如： Is it a boy or a girl? 是男孩还是女孩? There is a knock on the door. It must be the postman. 有人在敲门，一定是邮递员。 【说明】在答语中，常用来指本人，如说It’s me。
3.代替某些代词 代词it 还可用于代替指示代词this, that 以及复合不定代词something, anything, nothing等。如： “What’s this?”“It’s a new machine. ”“这是什么?”“是一种新机器”。 Nothing is wrong, is it? 没出什么问题，是吗? 二、it 作非人称代词的用法 1.基本用法 it 作非人称代词的用法，主要用于指时间、距离、价值、天气、气候及温度等自然现象。如： It’s too late to go there now. 现在去那儿已经太迟了。 It rained all day yesterday. 昨天下了一天的雨。 It can get very hot here. 这里有时会很热。 2.用于某些句型 It’s time for sth. 该做某事了。 It’s time to do sth. 该做某事的时候了。 It’s time for sb to do sth. 某人该干某事了。 It’s (about / high) time + that-从句. 某人该做某事了。(从句谓语用过去式，有时也用“should+动词原形”) It’s first (second) time + that-从句. 某人第几次干某事。(从句谓语用现在完成时)
turn的用法归纳如下: I. turn (n.) 顺序, 轮流 1. It's one's turn to do sth. 轮到某人做某事 It's your turn to make a decision. 2. take one's turn to do sth. = do sth. in turn =do sth. by turns轮流做某事 The nurses attended the patient in turn / by turns. =The nurses took turns to attend the patient. turn (vi.) 转动,转向,翻转 turn right / left = turn to the right / left turn to sth. / sb. (for help) turn to page 84 turn (link-v.) 变得…… turn green / yellow 变绿/黄了 Ten years later，he turned teacher. A. / B. a C. an D. the 注:此题考查turn 作连系动词的特殊用法,即turn 作连系动词时后接表语名词，省略冠词.所以此题的答案为A. 如果turn 后加into 则须在名词前加冠词a. 固定词组: 1. turn against 背叛 Nobody will turn against his country. 2. turn down 关小/ 拒绝 He turned down my suggestion without hesitation. Please turn down the gas. 3. turn from side to side 把身体转来转去 The naughty boy turned from side to side while answering questions in class. 4. turn in 上交 The child picked up a purse on the way and turned it in to the policeman. 5. turn ... into ... (使……)成为…… The farmers are turning waste land into rice fields. 6. turn off 关(水源、煤气、电灯等) / 避开(问题等) Turn off the light when you leave the room. 7. turn on 打开(水、煤气、电灯、无线电等) / 对……发怒 turn on the radio turn the gun on sb. 8. turn out 结果是/ 证明是/ 生产出 The weather yesterday turned out (to be) fine. The factory turned out more products than they had expected. 9. turn over (使)打翻/ 翻身/ 翻动/ 翻耕(土地) / 转危为安 The man turned over and went to sleep again when the telephone rang. 10. turn up 开大/ 出现/ 找到/ 证明是(= turn out to be)
turn的用法 一、turn 用作名词时,意为“轮流”“依次轮流的顺序”。例如: Now it’s your turn to read the text、现在轮到您读课文了。 It's my turn to use the bike、该轮到我用自行车了。 You must stand in line and wait for your turn、您必须排队等候。 含turn 的短语有: take turns 意为“替换”“轮流”; by turns 意为“轮流地”。例如: Please take turns to ask questions、请轮流提问。 We looked after the little boy by turns、我们轮流照瞧这个小男孩。 We take turns to make dinner、我们轮流做晚饭。(=We make dinner by turns、) 注:take one's turn to do sth、 = do sth、 in turn =do sth、 by turns轮流做某事 =take turns to do sth、=take turns at doing sth、=take turns doing sth、 The nurses attended the patient in turn / by turns、 =The nurses took turns to attend the patient、The twins take turns to make dinner、 =The twins take turns at making dinner、 =The twins take turns making dinner、 二、turn 用作系动词时,意为“变得”。例如: In spring the trees turn green and the flowers start to come out、春天,树变绿了,花儿开了? In autumn the leaves turn yellow、秋天树叶变黄。 She turned pale、她的脸变得苍白。 三turn 用作不及物动词时,意为“转向”“翻转”、 turn right / left = turn to the right / left 例如: Turn right、At the end of the road you’ll see the hospital、向右拐,在路的尽头就就是那家医院? Just go straight and turn left、一直往前走,然后向左拐? Turn to Page 12 in your workbook、翻到练习册第12页? He turned his face to the wall、她转过脸面向墙壁。 The road turns south outside town、此路在城外转弯向南。 turn to sth、 / sb、 (for help) When I am in difficulty, I always turn to him for help、我有困难时总就是找她帮忙。 四、转动,旋转 The wheel turns when its axis moves、轮轴动时,轮子也跟着转动。 He turned the key in the lock、她旋动插进锁里的钥匙。 五、使倒置,使颠倒;倾倒[O] He turned the glass upside down、她将玻璃杯子倒置。 六、turn 可以与介词或副词一起构成短语动词,表达不同的意思?常见的这些短语动词有: 1、turn over 意为“翻过来”例如: Tom turned over the note and read, “Come and look for me in the study、” 汤姆把便条翻过来读
at, in与on的用法区别 1. 表示时间，注意以下用法： ①表示时间的某一点、某一时刻或年龄等用at： I get up at six in the morning. 我早上六点钟起床。 He got married at the age of 25. 他25 岁结婚。 ②泛指一般意义的上午、下午或晚上以及月或年等较长的时间，一般用in：We watch TV in the evening. 我们晚上看电视。 He went to Japan in 1946. 他于1946 去了日本。 ③若表示星期几或某一特定的日期，则用on： He left here on the fifth of May. 他于5 月5 日离开这儿。 2. 表示地点、场所、位置等，注意以下用法： ①表示某一点位置，用at： We live at No 87 Beijing Road. 我们住在北京路87 号。 The hospital is at the end of the street. 医院在这条街的尽头。 与名词所有格连用表示地点，也用at。如： at my sister’s 在我姐姐家 at the doctor’s 在医务室 ②表示空间或范围，用in： What’s in the box? 这盒子里有什么? He lives in Paris with his wife. 他同他妻子住在巴黎。 但有时两者可换用：
The meeting was held at [in] the hotel. 会议在宾馆举行。 ③at与in的另一个区别是：at多用于指较小的地方，而in多用于指较大的地方：in Shanghai 在上海at the station 在车站 ④介词on 用于地点，主要指在某物的表面： What’s on the table? 桌上有什么? There’s a wallet lying on the ground. 地上有个钱包。 【注】在少数搭配中，也用介词on： He works on a farm. 他在农场工作。 3. 在某些搭配中，三者的区别与英国英语和美国英语有关： in the street (英) / on the street (美) 在街上 in the road (英) / on the road (美) 在路上 in the team (英) / on the team (美) 在这个队 at the weekend (英) / on the weekend (美) 在周末 at weekends (英) / on weekends (美) 在周末 4. 有时三者的差别与搭配习惯和用法有关： in bed / on the bed 在床上 in the tree (多指树外之物) / on the tree (多指树本身之物) 在树上
高考英语语法知识之It 的用法总结 1．It is + 被强调部分+ that ... 该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后。被强调部分可以是主语，宾语，状语。强调的主语如果是人，that可以由who换用。 如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。 It was they that (who) cleaned the classroom yesterday. It was in the street that I met her father. 2．It was not until + 被强调部分+ that ... 该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是not ... until ... 的强调形式。 It was not until she took off her dark glasses that I realized she was a famous film star. = Not until she took off her dark glasses did I realize she was a famous film star. = I didn’t realize she was a famous film star until she took off her dark glasses. 3．It is clear ( obvious, true, possible,certain....) that ..... 该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂是主语从句最常见的一种结构。 It is very clear that he’s round and tall like a tree.= That he’s round and tall like a tree is very clear. 4. It is important ( necessary, right, strange, natural...) that ... 由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。 It is important that we (should) learn English well. It is necessary that he (should) remember these words. 5. It is said (reported, learned....) that ... 该句型中的it 仍是形式主语，真正主语是that 引导的主语从句。该结构常译为＂据说（据报道，据悉．．．）＂。It is said that he has come to Beijing. 6. It is suggested ( ordered ... ) that ... 主句中的过去分词是表示请求，建议，命令等词时，that后的从句要用虚拟语气（should + 动词原形），should 可以省。常译为＂据建议；有命令．． It is suggested that the meeting ( should ) be put off. It was ordered that we ( should ) arrive there in two hours. 7. It is a pity ( a shame ... ) that ... 该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去．表示出乎意料，常译为＂竟然＂。没有这种意义时，则不用虚拟语气。 It is a pity that such a thing ( should ) happen in your class. It is a pity that he is ill. 8. It is time ( about time ,high time ) that ... 该句型中that 后的从句应该用虚拟语气，值得注意的是①常用过去时态表示虚拟．②有时也用should + 动词原形，should 不能省。常译为＂是（正是）．．．的时侯．．．＂。 It is time that children should go to bed. = It is time that children went to bed. 9. It is the first ( second ... ) time that ... 该句型中的that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中that 可以省去；it有时用this / that 替换．常译为＂这是某人第几次做某事了＂。 It is the first time I have been here. = This is the first time I have been here. 10 It is the +形容词最高级+ 名词+ that + ….. 该句型中的that 从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中that 可以省去；it有时用this / that 替换．常译为＂这是某人做过的最…的事情＂。 This is the best film that I have ever seen . That was the worst song that he had heard . 11. It is .... since ...
Turn 英音：[t?:n] 美音：[t?n] 及物动词vt. 1. 使转动,使旋转 He turned his head and saw a figure approaching in the darkness. 他转过头,看见在黑暗中有个人影走过来。 2. 旋动,拧动 He turned the key in the lock. 他旋动插进锁里的钥匙。 3. 翻,翻转[(+over)] She turned a page. 她翻过一页。 4. 使转向;使对着[O] He turned his face to the wall. 他转过脸面向墙壁。 5. 使倒置,使颠倒;倾倒[O] He turned the glass upside down. 他将玻璃杯子倒置。 6. (精神上)使错乱 Too much praise turned his head. 表扬太多使他昏了头。 7. 移动,挪动 He did not turn a finger to help. 他连举手之劳的忙也不肯帮。 8. 使变化;改变[O][(+from/into)] The barren land has been turned into fertile fields. 贫瘠的土地已改成良田。 9. 使变得;使成为[O8][(+into)] Cold turned their ears pink. 他们的耳朵冻得发红了。 10. 使变酸;使变质;使(树叶等)变色 Fall turned the leaves. 秋天树叶发了黄。 11. 把(注意力等)转向;把...用于;把...对准[O][(+to/on)] Please turn your attention to something more important. 请把你的注意力放到更重要的事情上。 12. 兑换;翻译;改写[(+into)] Turn this sentence into English. 将这句话译成英文。 13. 驱赶;打发[O] I'll turn you out of the house. 我要把你赶出门去。 14. 阻挡,击退 They turned the enemy's attack. 他们击退了敌人的进攻。 15. 赚取,挣得 He's doing odd jobs to turn an honest penny. 他打零工老老实实挣钱。16. 使具有优美形式 She has a knack for turning a phrase. 她善于辞令。 17. 拐过,绕过 He turned the street corner. 他拐过街角。
语法专题十：it的用法 1.指代事物、动物、婴儿或未知的人。 2.指天气、时间、距离、自然现象、环境等。 3.代替不定式，作形式主语或形式宾语(常与feel, consider, find, believe, make, take, imagine, think, suppose, regard等连用)。 4.代替动名词，作形式主语或形式宾语： It is no good / no use / useless / dangerous + doing I think it no good / no use / useless / dangerous + doing I think it no use complaining about their prejudice. 5.代替主语从句、宾语从句，作形式主语或形式宾语： It seems / appears / happens / turns out / proves + that… It is certain / likely / possible / probable + that… We have made it clear that she has nothing to do with the case. 6.用于强调句：It is / was … that / who… A student witnessed the car accident at the turning last night. (1 ) ( 2 ) ( 3 ) ( 4 ) (1) _________________________________________________________. (2) _________________________________________________________. (3) _________________________________________________________. (4) _________________________________________________________. It is not until +被强调的部分+ that… I didn’t realize she was a famous film star until she took off her dark glasses. ________________________________________________________________. 7. 其他重要句型： It is important (necessary, right, strange, natural) that…（should+动词原形） It is said (reported, learned…) that… It is suggested (ordered…) that…（should）+动词原形 It is a pity (a sham) that …（should）+动词原形 It happens (seems, looks, appears ) that... It occurs to sb. to do / that…：使某人想起…… It is/ has been +一段时间+ since ...+过去时 It will be +一段时间+ before ... It looks ( seems ) as if … It is no wonder…：难怪 When it comes to…：当谈到…… It comes about that…：发生 8. appreciate, love, like, hate, see to(负责，注意) + it + 从句 巩固练习： 1. It took us over an hour ______ along the street. A. walk B. to walk C. walking D. walked 2. I think it a great honour ______to visit your country. A. to invite B. inviting C. having invited D. to be invited 3. Many people now make ______a rule to buy cards for their friends before Christmas. A. themselves B. it C. that D. this 4.______is very clear to everyone that he's round and tall like a tree.
i n和o n的具体用法Newly compiled on November 23, 2020
英语中in 和on这两个介词的具体用法介绍如下： in：小小介词in，用途却很多。可表时间，表地点，表手段、方法、材料。（1）in表示时间，用于泛指一天的上午、下午、晚上等；用于某个较长的时间，如年、月、季节等。如：in the morning／afternoon／evening在上（下午）或晚上，in 2003 在2003年，in the day／daytime在白天in还可以表示“从现在起一段时间以后”。如： They will see you in a week．他们将在一周后去看你。 另外，in和at都可以表示时间，但in表示较长的时间，而at表示时间的某一点。例如：He got up late in the morning and had a meal at noon．他早上起得晚，所以只吃午餐。 （2）in表示地点、场所，译为“在......里”、“在......中”。如：in the factory 在工厂，in the room 在房间里，in the sun 在阳光下，in the middle of...在......的中央，in和at都可表示地点，而in表示的地点比at所表示的地点大。 （3）in表示用语言，用......材料。译为“用......，以......方式”。如：in English用英语，in ink用墨水 （4）in表示穿戴的状态，译为“戴着、穿着”。如：in the white shirt穿着白色的衬衫，in the cap戴着帽子 in表示“穿（戴）着”的介词，指状态，同wear一样。in后接表示服装类的名词或表示颜色的词。如： Kate is in a red skirt．／Kate wears a red skirt．凯特穿着红裙子。 on： 介词on表示时间、地点、方位等。
it的用法 一、考点聚焦 1、it的基本用法 （1）用作人称代词，代替前文提到过的事物。 The train has arrived. It arrived half an hour ago. （2）用以代替提示代词this, that。[来源:学,科,网Z,X,X,K] —What’s this? —It’s a knife. —Whose watch is t hat? —It’s mine. （3）起指示代词的作用，指一个人或事物。 —Who is knocking at the door? —It’s me. （4）指环境情况等。 It was very noisy(quiet) at the very moment. （5）指时间、季节等。 —What time is it? —It’s eight o’clock. It often rains in summer here. （6）指距离。 It is a long way to the school. （7）作形式主语。 It is not easy to finish the work in two days. It is no use crying over spilt milk. It is as pity that you didn’t read the book. （8）作形式宾语。 I think it no use arguing w ith him. I found it very interesting to study English. He made it clear that he was not interested in that subject. （9）用于强调结构。 It was Xiaoming whom(that)I met in the street last night. It was in the street that I met Xiaoming last n ight. It ws last night that I met Xiaoming in the street. It was I who met Xiaoming in the street last night. 2、含有“It is …”的句型 （1）It is time (for sb.) to do sth. It is (high) time that sb. did sth.(虚拟语气) （2）It is + 形容词（+of / for sb.）+ to do sth 通常用 of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise 等。 （3）It is + 形容词+ that + sb. + (should) do sth.（虚拟语气）[来源:学科网ZXXK] 能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probab le、impossible等。有时可省去should而直接用动词原形。如：It is important that we should pay close attention to grain. It is natural that he（should）say so. （4）It is no use/ good + doing sth. It is no use trying again = It is of no use to try again. （5）It is + 被强调部分+ that/who + …[来源:学科网ZXXK][来源:Z+xx+https://www.doczj.com/doc/1410327726.html,] Was it in the street that you met her? Who was it that called him“comrade”? It was not until yesterday that I met my old friend.
in，on，at的时间用法和地点用法 一、in, on, at的时间用法 ①固定短语： in the morning/afternoon/evening在早晨/下午/傍晚, at noon/night在中午/夜晚, （不强调范围，强调的话用during the night） early in the morning=in the early morning在大清早， late at night在深夜 on the weekend在周末（英式用at the weekend在周末，at weekends每逢周末） on weekdays/weekends在工作日/周末， on school days/nights在上学日/上学的当天晚上， ②不加介词 this, that, last, next, every, one, yesterday, today, tomorrow, tonight，all，most等之前一般不加介词。如，this morning 今天早晨 （on）that day在那天（that day更常用些） last week上周 next year明年 the next month第二个月（以过去为起点的第二个月，next month以现在为起点的下个月） every day每天 one morning一天早晨 yesterday afternoon昨天下午 tomorrow morning明天早晨 all day/morning/night整天/整个早晨/整晚（等于the whole day/morning/night） most of the time （在）大多数时间 ③一般规则 除了前两点特殊用法之外，其他≤一天，用on，＞一天用in，在具体时刻或在某时用at（不强调时间范围） 关于on 生日、on my ninth birthday在我九岁生日那天 节日、on Teachers’Day在教师节 （注意：节日里有表人的词汇先复数再加s’所有格，如on Children’s Day, on Women’s Day, on Teachers’ Day有四个节日强调单数之意思，on Mother’s Day, on Father’s Day, on April Fool’s Day, on Valentine’s Day） 星期、on Sunday在周日，on Sunday morning在周日早晨 on the last Friday of each month 在每个月的最后一个星期五 日期、on June 2nd在六月二日 on the second (of June 2nd) 在六月的第二天即在六月二日 on the morning of June 2nd在六月二日的早晨，on a rainy morning在一个多雨的早晨 on a certain day 在某天 on the second day在第二天（以过去某天为参照） 注意：on Sunday在周日，on Sundays每逢周日（用复数表每逢之意），every Sunday每个周日，基本一个意思。on a school day 在某个上学日，on school days每逢上学日。on the weekend在周末，on weekends每逢周末。 关于in in June在六月 in June, 2010在2010年六月
初中英语语法：it用作人称代词的用法 it用作人称代词的用法 1. 用于指事物 it用作人称代词最基本的用法就是代替前面已提到过的事物，以 避免重复： This is my watch, it’s a Swiss one. 这是我的手表，它是瑞 士制的。 I cannot find my watch; I must have lost it. 我找不到手表，我一定把它给丢了。 2. 用于指动物或婴儿 除用于指代事物外，还可指动物或性别不详的婴儿： “Where is the cat?” “It’s under the bed.” “ 猫在哪儿?”“在床下。” They got a baby and it was very lovely. 他们生了个孩子， 很可爱。 3. 用于上文提到的情况 He smokes in bed and I don’t like it. 他在床上抽烟，我不 喜欢他这样。 Her mother kept telling her not to go out at night, but it didn’t hel p. 她母亲老叫她晚上不要出去，但是没用。 4. 用于指人 it用于指人主要用确定未知人的身份： “Who is it?” “It’s me.” “是谁啊?”“是我。”
“Listen. Someone is crying.” “Oh, it must be Mary.” “听，有人在哭。”“噢，一定是玛丽。” Someone must have been here. But we have no idea who it was. 一定有人来过，但我们不知道是谁。 5. 指人时与he和she的区别 当it用于指人时，主要用于确定未知的或者是身份不明的人，若 是指已知的或身份明确的人，则应根据情况使用he或she。比较： I hear a knock at the door. It must be the postman. 我听 见有人在敲门，一定是邮递员来了。 Jim is at the door. He wants to see you. 吉姆在门口，他想 见你。 A tall man stood up and shook hands with her. It was the general manager. 一个高个子站起来同她握了手，他是总经理。 The general manager just called. He told us to wait for him at the gate. 总经理刚来过电话，他叫我们在门口等他。 6. 指物时与one的区别 两者均可代替前面提到的事物，区别是：it指的是与前面已提到 的事物为同一物，此时的it等于“the (this, that, my...)+名词”;而one 指的是与前面已提到的事物为同一类物，此时的one等于“a+ 名词”。比较： I have a dictionary but I’ve lent it to Mary. 我有一本词典，但把它借给玛丽了。 I haven’t a dictionary; can you lend me one? 我没有词典，你能借我一本吗?