1、1、 (so) happened（chanced） that +clause.
= sb. happened /chanced to do sth.
=sb.did sth. by chance.
2、 It seems that sb. do/ be doing/ have done/ had done
= Sb. seems to do/ be doing/ have done/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
2、去过北京。
＝He seemed to have 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
3、have 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 have 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
4、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
5、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 have 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 /
6、 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电话了。
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。
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