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1、一、以形式主语it引导的句型。 句型1. It (so) happened（chanced）that +clause. = sb. happened /chanced to do sth. =sb.did sth.by chance. 如： It happened that he was out when I got there. 当我到那儿时，碰巧他不在。He happened to beout when I got there.= It chanced that he was out when I got there= He was out by chancewhen I got ther
2、e. 句型2.It seems that sb. do/ be doing/ have done/ had done= Sb. seems to do/ be doing/ havedone/to be done/to have been done（还有动词appear等可这样使用）如:It seemed that he had been to Beijing before.他好象以前去过北京。He seemed to have beento Beijing before. 句型3. It is / was被强调的部分that(who)+剩余的部分.如： It wasnt until he c
3、ame back that I went to bed.直到他回来我才睡觉。(一定要注意被强调句型中的谓语动词否定的转移)。 It was because he was ill that he didnt come to school today.只因为他有病了今天没有来上学。（只能用because而不能用for, as 或since） It is I who am a student. 我确实是个学生。（am不能用are代替。） 句型4.It is high time (time/ about time)+ (that) 主语should do / did+其它。（从句中的谓语动词用的是虚拟
4、语气。）如: It is high time that we should go / went home.我们该回家了。 句型5.It is / was said ( reported)that+从句. 如： It was said that he had read this novel.据说他读过这篇小说。He was said to have read thisnovel. 句型6.It is impossible / necessary/ strangethat clause.(从句中的谓语用shoulddo / should havedone，其形式是虚拟语气。)如： It is st
5、range that he should have failed in this exam.句型7.It is + a pity/ a shamethat clause.(注意从句中的谓语动词用should do或should have done的形式，但should可以省略。)如： He didnt come back until the film ended. It was a pity that he should have missed thisfilm. 他直到电影结束才回来。他没有看到这部电影真可惜。 句型8.It is suggested / ordered/ commanded
6、 /that +clause.(从句的谓语动词用should do, 但should可以省略。)如： It is suggested that the meeting should be put off.有人建议推迟会议。 句型9.It is/was表示地点的名词where+从句。（注意本句不是强调句型，而是以where引导的定语从句。）如： It was this house where I was born.请比较：It was in this house that I was born.(后一句是强调句型。) 句型10.It is / was +表示时间的名词when+从句。（注意本句型
7、也不是强调句型，而是以when引导的定语从句。）如： It was 1999 when he came back from the United States. 请比较：It was in 1999 that he cameback from the United States. 句型11.It is well-known that从句。如： It is well-known that she is a learned woman.众所周知，她是个知识渊博的妇女。 句型12.It is +段时间since+主语did. 请比较： It was +段时间since+主语had done. 如：
8、It is five years since he left here.他已经离开这儿五年了。 It was five years since he left here.（同上）注意下列句型的翻译:It is five years since he lived here.他从这儿搬走已经有五年了。 句型13.It +谓语段时间before+主语谓语.（ before引导的是时间状语从句。）如： It wasnt long before the people in that country rose up.没有多久那个国家的人民就起义了。 It will be three hours befor
9、e he comes back.三个小时之后他才能回来。 句型14.It is +形容词(possible, impossible, necessary等) for+ sb.+ to do. 如： It is impossible for me to finish this work before tomorrow.我明天之前完成此工作是不可能的。 句型15.It is +（心理品质方面的）形容词of + sb. +to do.= 主语+ be +形容词to do.(常用的形容词有：kind, stupid; foolish, good, wise等。)如： It is kind of you
10、 to help me.You are kind to help me.你真好给我提供了帮助。二、定语从句：句型16.由as引导的非限定性的定语从句。如： As we have known, he is a most good student.众所周知，他是个很好的学生。请比较：It is well-known that he is a most good student.（前一个是定语从句，而后者是个主语从句。）句型17.由which引导的非限定性的定语从句。如： He is a professor, which I have been looking forward to becoming
11、. 他是个教授，那是我一直盼望的职业。（因为先行词professor是表示职业的名词，因此引导词用which，而不用who。句型18.由where, when引导的定语从句（其中包括限定性的或非限定性的。）如： This is the house where I used to come.请比较：This is the house which / that I used tocome to. This is the day when I joined the Party.请比较：This is the day which / that I joined theParty on. （说明：关于t
12、hat与which之间的区别，请看关系代词that和which的区别。）三、让步状语从句 句型19.No matter what / which / who / where / when / whose从句，主句.(注意从句中的时态一般情况下用一般现在时态。)如： No matter what you do, you must do it well.请比较：Whatever you do, you must do it well. 无论你做什么，一定要做好。 No matter where you go, please let me know.请比较：Wherever you go, plea
13、se let me know.你无论去哪儿，请通知我。 （说明：这两种句型形式不同，而意义完全相同。） （注意：I will tell whoever would like to read it. 句中的whoever不能用whomever来代替。因为它即作动词tell的宾语，又作后面从句的主语。）四、条件状语从句 句型20.When / So long as / As long as / Once +从句，主句。（从句也可以放在主句之后。）如： As long as you give me any money, I will let you go.只要你给我一些钱，我就让你走。 Once y
14、ou have begun to learn English, you should learn it well. 一旦你开始学习英语，你应该把它学好。句型21.主句on condition that+从句.如： I will go with you on condition that you give me a sum of money.我和你一起去的条件是你给我一些钱。 句型22.主句unless+从句.(注意：由于unless本身是否定词，所引导的从句的谓语动词用肯定而不用否定。)如： I will go there tomorrow unless it rains.我明天去那儿除非下雨
15、。句型23.祈使句，and/ and then+主句。（注意：祈使句也可用一个名词短语。）如： Use your head, and you will find a good idea.动脑筋想一想，你就会想出一个好主意。 Another word, and I will beat you.你再说一句，我就揍你。 句型24.If +necessary / impossible/ important等，主句.(注意：if与形容词之间的it is被省略。)如： If necessary, I will do it. 如果有必要的话，我来做此事。 五、原因状语从句 句型25.主句in case+从句
16、.（in case表示以免）如： I will take my raincoat in case it rains.我要把雨衣带上以免下雨。 句型26.主句due to / because of / owning to / + the fact that +从句。如： He did not come to school because of the fact that he was ill.由于他有病了，所以没有来上学。 六、时间状语从句 句型27.When / While / As +从句，主句.如： When I was in the country, I used to carry some water for you.当我在农村时，我常常给你打
