句型1. It happened(chanced) that +clause. = sb. happened /chanced sth. = sb. did sth. by chance. 如：
It happened that he was out when I got there. 當我到那兒時，碰巧他不在。=He happened to be out when I got there.= It chanced that he was out when I got there= He was out by chance when I got there.
句型2、It seems that sb. do/ be doing/ have done/ had done= Sb. seems to do/ be doing/ have done/ had done 如：(還有動詞appear可這樣使用)
It seemed that he had been to Beijing before.好象妳以去過北京。=He seemed to have been Beijing before.
句型3. It is / was+被強調的部分+that(who)+剩余的部分.如：
It wasn’t until he came back that I went to bed.直到他回來我才睡覺。(壹定要註意被強調句型謂語動詞否定的轉移，及形式)。
It was because he was ill that he didn’t come to school today.只因為他有病了今天沒有來上學。(只能用because而不能用for, as 或since)
It is I who am a student. 我確實是個學生。(句中am不能用are來代替。)
句型4、It is high time (time/ about time) (that) 主語+should do / did+其它。(註意從句中的謂語動詞用的是虛擬語氣)
It is high time that we should go / went home.我們該回家了。
句型5、It is / was said ( reported…)+that+從句. 如：
It was said that he had read this novel.據說他讀過這篇小說。=He was said to have read this novel.
句型6、It is impossible / necessary/ strange…that clause.(從句中的謂語用should+do / should have done，其形式是虛擬語氣。)如：
It is strange that he should have failed in this exam.真奇怪，他這次考試沒有及格。
句型7、It is + a pity/ a shame…that clause.(註意從句中的謂語動詞用should do或should have
done的形式，但should可以省略。)如：
He didn’t come back until the film ended. It was a pity that he should have missed this film. 他直到電影結束才回來。他沒有看到這部電影真可惜。
句型8、It is suggested / ordered/ commanded /…that +clause.(從句的謂語動詞用should do, 但should可以省略。)如：
It is suggested that the meeting should be put off.有人建議推遲會議。
句型9、It is/was+表示地點的名詞+where+從句。(註意本句不是強調句型，而是以where引導的定語從句。)如：
It was this house where I was born.請比較：It was in this house that I was born. (後壹句是強調句型。)
句型10、It is / was +表示時間的名詞+when+從句。(註意本句型也不是強調句型，而是以when引導的定語從句。)如：
It was 1999 when he came back from the United States. 請比較：It was in 1999 that he came back from the United States.
句型11、It is well-known that+從句。如：
It is well-known that she is a learned woman. 眾所周知，她是個知識淵博的婦女。
句型12、It is +段時間+since+主語+did. 請比較：
It was +段時間+since+主語+had done. 如：
It is five years since he left here.他已經離開這兒五年了。
It was five years since he left here.(同上)
句型13、It +謂語+段時間+before+主語+謂語.( before引導的是時間狀語從句。) 如：
It wasn’t long before the people in that country rose up.沒有多久那個國家的人民就起義了。
It will be three hours before he comes back.三個小時之後他才能回來。
句型14、It is +形容詞+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 +(心理品質方面的)形容詞+of + sb. + to do. = 主語+ be +形容詞+to do.(常用的形容詞有：kind, stupid; foolish, good, wise等。)如：
It is kind of you to help me.=You are kind to help me.妳真好給我提供了幫助。
二、定語從句：
句型16、由as引導的非限定性的定語從句。如：
As we have known, he is a most good student.眾所周知，他是個很好的學生。請比較：It is well-known that he is a most good student.(前壹個是定語從句，而後者是個主語從句。)
句型17、由which引導的非限定性的定語從句。如：
He is a professor, which I have been looking forward to becoming.
他是個教授，那是我壹直盼望的職業。(因為先行詞professor是表示職業的名詞，因此引導詞用which，而不用who。(註意：關於which和as之間的比較請看語法的定語從句部分。)
句型18、由where, when引導的定語從句(其中包括限定性的或非限定性的。)如：
This is the house where I used to come.請比較：This is the house which / that I used to come to.
This is the day when I joined the Party.請比較：This is the day which / that I joined the Party on.
說明：關於that與which之間的區別，請看語法中的定語從句。
三、讓步狀語從句
句型19、No matter what / which / who / where / when /
whose+從句，+主句。註意從句中的時態壹般情況用壹般現在時態。如：
No matter what you do, you must do it well.請比較：Whatever you do, you must do it well. 無論妳做什麽，壹定要做好。
No matter where you go, please let me know.請比較：Wherever you go, please let me know.妳無論去哪兒，請通知我。
說明：這兩種句型形式不同，而意義完全相同。
註意：I will tell whoever would like to read it.
句中的whoever不能用whomever來代替。因為它即作動詞tell的賓語，又作後面從句的主語。
四、條件狀語從句
句型20、When / So long as / As long as / Once +從句，+主句。(從句也可以放在主句之後。)如：
As long as you give me some money, I will let you go.只要妳給我壹些錢，我就讓妳走。
Once you have begun to learn English, you should learn it well.
壹旦妳開始學習英語，妳應該把它學好。
句型21、主句+on condition that+從句。如：
I will go with you on condition that you give me some money.我和妳壹起去的條件是妳給我壹些錢。
句型22、主句+unless+從句.(註意：由於unless本身是否定詞，所引導的從句的謂語動詞用肯定。)如：
I will go there tomorrow unless it rains.我明天去那兒除非下雨。
句型23、祈使句，+and/ and then+主句。(註意：祈使句也可用壹個名詞短語。)如：
Use your head, and you will find a good idea.動腦筋想壹想，妳就會想出壹個好主意。
Another word, and I will beat you.妳再說壹句，我就揍妳。
句型24、If +necessary / impossible/ important等，+主句。如：
If necessary, I will do it. 如果有必要的話，我來做此事。
五、原因狀語從句
句型25、主句+in case+從句。(in case表示以免)如：
I will take my raincoat in case it rains.我要把雨衣帶上以免下雨。
句型26、主句+due to / because of / owning to / + the fact that +從句。如：
He did not come to school because of the fact that he was
ill.由於他有病了，所以沒有來上學。
六、時間狀語從句
句型27、When / While / As +從句，+主句。(關於它們之間的區別請看語法。)如：
When I was in the country, I used to carry some water for you.當我在農村時，我常常給妳打水。
句型28、主句+after / before +從句. 如：
They hadn’t been married four months before they were
devoiced.他們繪結婚不到四個月就離婚了。
We went home after we had finished the work.我們做完此工作就回家了。
句型29、主語+肯定謂語+until+從句(或時間).請比較：
主語+否定謂語+until+從句。如：
I worked until he came back.我壹直工作到他回來。
I didn’t worked until he came back.他回來我才開始工作。
句型30、As soon as / Immediately / Directly / Instantly / The moment / The instant / The minute +從句，+主句. 如：
My father went out immediately I got home.我壹到家，我父親就出去了。
句型31、No sooner +had + 主語+done…than +主語+did. 請比較：
主語+had + no sooner +done…than +主語+did. 如：
No sooner had I got to Beijing than I called you.我壹到北京就給妳打電話了。
I had no sooner got to Beijing than I called you.
句型32、Hardly +had +主語+done…when / before + 主語+did.請比較：主語+had +hardly +
done…when / before +主語+did.
Hardly had she had supper when she went out. 她壹吃完晚飯就出去了。
She had hardly had supper when she went out.
句型33、By the time+從句，+主句.(註意時態的變化。)如：
By the time you came back, I had finished this book.到妳回來時，我已經寫完了這本書。
By the time you come back, I will have finished this book.到妳回來時，我將寫完這本書。
句型34、each / every time +從句，+主句. (這時相當於whenever 或no matter
when引導的從句。從句也可放在主句之後。)如：
Each time he comes to Harbin, he always drops in on me.每當他來哈爾濱，總是隨便來看看我。
七、地點狀語從句
句型35、Where +從句，+主句. 如：
Where there is no rain, farming is difficult or impossible.哪裏沒有雨水，種莊稼是很難的或者是不可能的。
句型36、Anywhere / wherever+從句，+主句. 如：
Anywhere I go, my wife goes too.無論我去哪兒，我的妻子也去哪兒。
I will go wherever you suggest.妳建議我去哪兒，我就去哪兒。
八、目的狀語從句
句型37、主句+in order that / so that +從句.如：
I got up early in order that I could catch the first bus.我起得很早，以便能趕上早班車。
句型38、主句+for + sb. +to do.(註意動詞不定式復合結構在這兒作目的狀語。)如：
He came here for me to work out this problem.他來這兒叫我幫他解出這道難題。
九、結果狀語從句
句型39、主句+so that+從句. 如：
It was very cold, so that the river froze.天氣很冷，因此河水結冰了。
句型40、So+形容詞/ 副詞+特定動詞+主語+…+that+從句.
So interesting is this book that I would like to read it again.這本書那麽有趣，我想再讀壹遍。
句型41、主語+謂語+such+名詞+that+從句.如：
He made such rapid progress that he was praised by the teacher.他進步很快，老師表揚了他。
句型42、Such was + 主語+that +從句.(這是個完全倒裝句。)如：
Such was the force of the explosion that all the windows were broken.爆炸力這麽大，所有的窗戶都被震碎了。
十、比較狀語從句
句型43、The +形容詞比較級……，(主句)the +形容詞比較級+……如：
The sooner you do it, the better it will be.越早越好。
句型44、主語+謂語+as +形容詞原級+as +被比較的對象. 如：
He is as busy as a bee.他非常忙。
句型45、主語+謂語+the+形容詞比較級+of / between …
He is the taller of the two.他們倆人中他高。
句型46、主語+謂語+倍數+as+形容詞原級+as+被比較的對象.如：
This room is three times as large as that one.這個房間是那個房間的三倍大。(這個房間比那個房間大兩倍。)
句型47、主語+謂語+百分數/倍數+形容詞比較級+than+被比較的對象.如：
This city is twice larger than ours.這個城市比我們城市大兩倍。
The early rice output in that commune was 200% more than that of 2000.那個公社的早稻產量是2000年的兩倍。
句型48、主語+謂語+the size / length/ width/ height +of +被比較的對象.如：
Our building is twice the height of yours.我們的大樓比妳們的高兩倍。
十壹、其它句型
句型49、It doesn’t matter wh-+從句。如：
It doesn’t matter to me what you will do tomorrow.妳明天做什麽與我無關。
It doesn’t matter whether you will come or not.妳來不來無關緊要。
句型50、形容詞/ 副詞 / 名詞(可數單數)+as / though +主語+謂語，+主句.如：
Young as he is, he knows a lot.雖然他很小，但他知道得很多。
Hard he works, I am sure that he can’t pass this exam.雖然他學習很努力，這次考試他肯定不能及格。
Child as he is, he knows a lot.雖然他是個孩子，但他懂得很多。
句型51、Were / Should / Had +主語+謂語，+主句.如
Were I you, I would have gone there yesterday.如果我是妳的話，昨天我就去那兒了。
句型52、Only +狀語+特定動詞+主語+謂語…
Only by this means can I do this work well.只有用那種方式我才能做好此工作。
Only because he was ill did he not come to school.只因為他有病了才沒有來上學。
Only then did I realize that I had been wrong.只有那時，我才認識到我錯了。
句型53、Not only +特定動詞+主語+謂語…but also+主語+謂語…
Not only did he learn English well but also he spoke French very well. 他不但英語學得好，而且法語講得很流利。
句型54、whether….or…, neither…nor…, either…or…
句型55、主語+doubt+whether + 從句. 請比較：
主語+特定否定詞+doubt+that+從句. 如：
I don’t doubt that he will come this afternoon.我確信他下午壹定能來。
十二.句型1：too +adj./adv.+to do
The boy is too young to go to school.這孩子太小不能上學。
句型2：adj./ad v.+enough to do
The girl is old enough to go to school.這女孩到了上學的年齡。
句型3：...in order to do
He stood up in order to see better.他站了起來，好看清楚些。
句型4：...have to do
You'll have to go home now.現在妳得回家了。
句型5：There's no time to do this.
There's no time for me to play now.現在我沒時間玩。