【要点点拨】
　　1. Its the first time that ... (从句中用现在完成时)
　　It was for the first time that ... (强调句，对状语for the first time进行强调)
　　Its (high) time that ... (从句中用过去时或should do)
　　2. Its the same with sb. / So it is with sb. 表示某人也如此 (用于前句中既有肯定又有否定或两个不同类的谓语动词)
　　3. ...be about to do / be doing ... when ... 正要做 / 正在做……就在那时……
　　4. A is twice / three times as+原级+as B.
　　A is twice / three times the n. of B.
　　A is twice / three times +比较级+than B.
　　5. Its a waste of time / money doing / to do ... 
　　Its no use / good doing ...
　　Its possible / probable / (un) likely that ...
　　It makes great / no sense to do ... 做某事很有/没意义
　　6. Theres no use / good doing ...
　　Theres no sense / point (in) doing ...
　　There is no need for sth. / to do ...
　　There is (no) possibility that ...（同位语从句）
　　7. The + 比较级……，the + 比较级……越……，越…….
　　注意：前半句为从句，用一般现在时代替将来时；
　　8. It seems / appears (to sb.） that sb. ... 在某人看来某人……
　　= Sb. seems / appears to be / to do / to be doing / to have done ...
　　It seems / looks as if ... 好象 / 似乎……
　　9. It (so) happened that sb. ... 某人碰巧……
　　= Sb. happened to be / to do / to be doing / to have done ...
　　10. It is said / thought / believed / hoped / supposed ... that sb. ...
　　= Sb. is said to be / to do / to be doing / to have done ... (注意：这种句型里如带动词hope则不能变成简单句，因为无hope sb. to do结构)
　　11. ... such ... that ... 如此……以致于…… (引导结果状语从句)
　　 ... such ... as ... 像……的这种……(as为关系代词，引导定语从句，在从句里充当主、宾、表)
　　12. Do you mind if I do sth.? / Would you mind if I did sth.?
　　13. The chance is that ... / (The) Chances are that ... 很可能……
　　14. Check / Make sure / See to it / See that ... (从句中常用一般现在时) 确信 / 务必……
　　15. depend on it that ... 取决于…… 
　　 see to it that ... 负责 / 设法做到……
　　注意：除了except / but / in等介词可以直接接that从句外，其它介词后必须用it做形式宾语；
　　16. It is / was +介词短语/从句/名词/代词等+that ...
　　How / When / Where / Why is / was it that ...?
　　注意：此句型为强调句，当被强调的主语为表示人的词时，还可用who连接；强调主语时，从句后的谓语动词应与前面的主语保持一致；注意与定语从句的区别。
　　17. How is it that ... (这几个句型都表示“怎么会……?”“怎么发生的?”)
　　How come+从句？
　　How does / did sth. come about? (How did it come about that ...?)
　　如：How come you are late again?
　　18. There seems / appears / happens to be / must be / cant be / is (are, was, were) said to be / is (are, was, were) thought to be ...
　　表示“似乎有 / 碰巧有 / 一定有 / 不可能有/ 据说有/认为有……”
　　介词 (如of） there being
　　want / wish / expect there to be要 / 希望 / 期待有……
　　adj. / adv. enough for there to be ...足够……会有……
　　注意：there being / there to be为there be的非谓语形式；It is said / thought that there is / are ... =There is / was / are / were said (thought) to be ... 如：
　　I have never dreamed of there being such a good chance for me.
　　It wont be cold enough for there to be a frost tonight.
　　19. 疑问词 + 插入语 + 陈述语序?
　　Who do you think hell have attend the meeting?
　　20. But for + n. / pron.,sb. / sth. would (not) have done ... 要不是……，某人早就……(表示虚拟语气)=If it had not been for ..., ... / If there had not been ..., ...
　　21. It won (t) be long before+ 从句 (从句中用一般现在时) 不久 / 很久就要……
　　It was (not) long before + 从句(从句中用一般过去时) 不久/很久才……