文档介绍：语法回顾篇：
专四语法考点虚拟语气、情态动词、非谓语动词、复合句、倒装、小语法（省略，时态，反义疑问句，代词，强调句，主谓一致，冠词，形容词及副词）、as特殊使用方法。
专四英语语法考点串讲之一虚拟语气
通常说来，有下列多个考点需要考生注意(十考点及两备考点）
考点1. 和现在事实相反
从句谓语动词用did(be用were)，
主句谓语动词would(should,could,might)+do；
考点2. 和过去事实相反
从句谓语动词用had done，
主句谓语动词用 would(should,could,might)+ have done；
比如：
_________the party much more if there hadn’t been quite such a crowd of people there.
A. would enjoy B. will have enjoyed
C. would have enjoyed D. will be enjoying
of us would have enjoyed the party much more if there _________ quite such a crowd of people there.
A. weren’t B. hasn’t been C. hadn’t been D. wouldn’t
，
从句谓语动词用：did(should+do或were + to do)，
主句谓语动词用：would(should,could,might)+do。
比如：
43. If your car ___ any attention during the first 12 months, take it to an authorized dealer.(）
A. shall need C. would need
B. should need D. will need
考点4. 时态交叉现象，也就是主句和从句动作发生在不一样时间段
比如：
If you had gone to see the doctor，you would be all right ,你现在就没事了。
，但从句语序要用到装，立即were,had或 should移至主语前面形成倒装，但否定词not不前移。
比如：
, he would not have recovered so quickly.（）
A.    Hadn't he been taken good care of
B.    Had he not been taken good care of
C.    Had not he been taken good care of
D.    Had he been not taken good care of
考点6. insist(一个坚持）；order command(两道命令）；suggest， advise, propose（三条提议）；ask, require, request, demand(四点要求）及对应名词从句，谓语要使用：should+动词原形或动词原形
比如：
58. It was recommended that passengers ___ smoke during the flight.()
A.     not B. need not C. could not D. would not

is +advisable, essential important,, imperative, incredible,等等相关从句，
谓语要使用：should+动词原形或动词原形
比如：
is imperative that students ____ their term papers on time.（）
A. hand in B. would hand in 
C. have to hand in D. handed in
is high(about) time that结构中，从句使用通常过去式
比如:
5