一、以形式主语it引导的句型。
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. 当我到那儿时，碰巧他不在。
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：(还有动词appear可这样使用)
It seemed that he had been to Beijing before.好象你以去过北京。
二、定语从句：
句型1、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。
句型2、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.
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。(注意：关于which和as之间的比较请看语法的定语从句部分。)
三、让步状语从句
句型1、No matter what / which / who / where / when /
whose+从句，+主句。注意从句中的时态一般情况用一般现在时态。如：
No matter what you do, you must do it well.
四、条件状语从句
句型1、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 some money, I will let you go.只要你给我一些钱，我就让你走。
句型2、主句+on condition that+从句。如：
I will go with you on condition that you give me some money.我和你一起去的条件是你给我一些钱。
句型3、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。)如：
I will go there tomorrow unless it rains.我明天去那儿除非下雨。
五、原因状语从句
句型1、主句+in case+从句。(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2、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1、When / While / As +从句，+主句。(关于它们之间的区别请看语法。)如：
When I was in the country, I used to carry some water for you.当我在农村时，我常常给你打水。
句型2、主句+after / before +从句. 如：
They hadn’t been married four months before they were
devoiced.他们绘结婚不到四个月就离婚了。
We went home after we had finished the work.我们做完此工作就回家了。
七地点状语从句
句型1、Where +从句，+主句. 如：
Where there is no rain, farming is difficult or impossible.哪里没有雨水，种庄稼是很难的或者是不可能的。
句型2、Anywhere / wherever+从句，+主句. 如：
Anywhere I go, my wife goes too.无论我去哪儿，我的妻子也去哪儿。
八、目的状语从句
句型1、主句+in order that / so that +从句.如：
I got up early in order that I could catch the first bus.我起得很早，以便能赶上早班车。
九、结果状语从句
句型1、主句+so that+从句. 如：
It was very cold, so that the river froze.天气很冷，因此河水结冰了。
句型2、So+形容词/ 副词+特定动词+主语+…+that+从句.
So interesting is this book that I would like to read it again.这本书那么有趣，我想再读一遍。
十、比较状语从句
句型1、The +形容词比较级……，(主句)the +形容词比较级+……如：
The sooner you do it, the better it will be.越早越好。
句型2、主语+谓语+as +形容词原级+as +被比较的对象. 如：
He is as busy as a bee.他非常忙。
希望以上的初中英语句型可以帮你在写作上解决一个大忙。