1、 (so) happened（chanced） that +clause.
= sb. happened /chanced to do sth.
sth. by chance.
2、 it seems that sb. do/ be doing/ h**e done/ had done
sb. seems to do/ be doing/ h**e done/to be done/to h**e 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 h**e been to beijing before
3、 it is / was＋被强调的部分＋that(who)+剩余的部分。
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语气。）
5、 it is / was said ( reported…)＋that+从句。
6、 it is impossible / necessary/ strange…that clause.(从句中的谓语用should＋do / should h**e done，其形式是虚拟语气。)
7、 it is + a pity/ a shame…that clause.(注意从句中的谓语动词用should do或should h**e done的形式，但should可以省略。)
8、 it is suggested / ordered/ commanded /…that +clause.(从句的谓语动词用should do, 但should可以省略。)
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。）
10、 it is / was +表示时间的名词＋when+从句。（注意本句型也不是强调句型，而是以when引导的定语从句。）
11、 it is well-known that＋从句。
12、 it is +段时间＋since+主语＋did. 请比较：
it was +段时间＋since+主语＋had done.
13、 it +谓语＋段时间＋before+主语＋谓语。（ before引导的是时间状语从句。）
14、 it is +形容词(possible, impossible, necessary等) ＋for+ sb.+ to do
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。)
16、 由as引导的非限定性的定语从句。如：
as we h**e known, he is a most good student.
17、 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。)
18、 when / so long as / as long as / once +从句，＋主句。（从句也可以放在主句之后。）
19、 as soon as / immediately / directly / instantly / the moment / the instant / the minute +从句，＋主句。
20、 no sooner +had + 主语＋done…than +主语＋did. 如：
no sooner had i got to beijing than i called you.我一到北京就给你打**了。
21、 hardly/scarcely/ rarely +had +主语＋done…when / before + 主语＋did.
22、 only +状语＋特定动词＋主语＋谓语…
only by this means can i do this work well.只有用那种方式我才能做好此工作。
高中英语主要句型
一 以形式主语it引导的句型。so happened chanced that clause.碰巧 sb.happened chanced to do sth.sb.did sth.by chance.it happened that he was out when i got there.当我到那...
高中英语主要句型练习
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.sth.by chance.如 当我到那儿时，碰巧他不在。句型2.it seems that sb.do be doing h e ...
高中英语重点句型
book 1 unit 1 重点句型book 1 unit 2 重点句型 1.状语从句的省略 while 分词结构 if 引导的让步状语从句。2.强调句 it is that1.特殊疑问词 do you think believe imagine guess 其他。was a time than 与...