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as引导时间状语从句比较状语从句 1. as conj. (1) 引导时间状语从句，与while相近, 强调两个动作同时 发生，或 某事一发生,另一事立即发生。 We talked as we walked.As I was walking home,it began to rain. (2) 引导原因状语从句，与because 相近，意为“由于”、“因为”。 As he liked walking,we went there on foot. (3) 引导方式状语从句，意为“如”、“像”。 You should do as the teacher tells you to. (4) 引导让步状语从句，意为“尽管”、“虽然”、“即使”(形容词、副 词, 动词等在句首,而as置其后，同though) Child as he is,he knows a lot. (5) 引导比较状语从句The weather was not so wet as it is today. (6) as ... as possible=as ... as one can/could 1. as prep.(1)如，像 She spoke of me as her dearest friend. 作为，充当 He was famous as a teacher. 2. relative pron. (1)As everybody can see, this elephant is like a snake. (2) Such books as this are too difficult for beginners. (3) I study in the same school as he (does). (4) He knows as many people as are present at the meeting. 2. (1)the number of + n.(pl.)“……的数量”，作主语时，谓语动词用单数形式。 (2)a number of + n.(pl.)“许多，若干”，number前可用great,large,good, small,certain修饰,它所修饰的名词作主语时，谓语动词用复数形式。 3. as many as +数词+名词复数形式，表“多达”。as much as +数词+名词复数形式，表示“金钱\时间、重量”等方面的程度或数量。 as many+可数名词复数+as as much+不可数名词+as as many as twenty buildings as much as 1000 pounds as many friends as you have as much water in this bottle as in that one 联想: as long as as high as as wide as 4. it: 指代上文提过的名词，即同类事物. 它可以替代单数可数名词和不可数名词。 one：代替上文出现过的可数名词，既可指人，也可指物，即同类异物。它可以替代单数可数名词。前边可用this，that修饰，但不用物主代词。前面有修饰词时，可以加冠词。 ones：one的复数形式，代替复数可数名词。若前有形容词修饰则可加these或those。但前面不能用物主代词修饰。若前面有修饰词时，可以加冠词。 that：代替上文出现的名词，表示与前面同类的东西。既可代替可数名词，又可代替不可数名词，常要求有后置定语，一般不指人。它还可以代替上文全句的内容，而it，one则不能。 those：代替上文出现的可数名词的复数形式，表示特指。有时the ones和those可互换，常常要求有后置定语。 5. population：集体名词，不可数，作主语时若表示人口时，后面的谓语动词用单数. 若指人时，后面的谓语动词用复数。 What’s the population of +地点? have a population of +数字 have a (large/small)population 6. do things to do do much/a lot to do do something to do do little to do do nothing to do 7. A是B的多少倍 A is ... 倍数 /百分数/ 分数+adj./adv.(比较级)+than B A is ... times as +adj./adv.(原级)+as B A is ...倍数/分数百/分数 the size/height/length/width… + of B 注：用times表示倍数，一般只限于包括基数在内的三倍或三倍 以上的数。表示两倍可以用twice或double。 8. would like sth. would like to do sth. would like sb.to do sth. 9. take turns to do sth. take turns at doing sth. do sth.by turns do sth.in turn It’s one’s turn to do sth. Whose turn is it to do sth.? wait your turn = wait until it is your turn. 10.offer sth. offer sb.sth./offer sth.to sb. offer to do sth. offer sb.money for sth. offer sb.sth.for money offer advice/suggestions accept one’s offer make an offer of money for sth. 11.discover 发现(已存在但并不为人所知)invent 发明(原来没有而经过发明创造的东西)find 找到(发现或找到自己所需要的或丢失的东西，强调结果)find out 发现，获知(经过努力查出事实真相) 12.room n. ［C］房间rooms ［U］空间make room for standing room take up too much room (接受、采纳事物的)余地 There is no room for doubt. space n.［U］空间；空地(=room) 13.prepare准备，预备，调制 prepare sth. prepare for sth. prepare sb.for sth. prepare to do sth. be prepared for sth./get ready for sth. be prepared to do sth. make preparations for 14.ship n.船，轮船 take a ship,by ship vt.用船运 e.g.Fresh fruit will be shipped to England. (以火车、卡车等)运送...，输送... They shipped goods by rail. 15.be busy with sth. / doing sth. 区别: sound：任何能听到的声音 voice：人的说话声或唱歌声 noise：较大的使人不愉快的声音 
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