文档介绍：-
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语法回忆篇：
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
C. have to hand in D. handed in
is high(about) time that的构造中，从句使用一般过去式
例如:
54 It’s high time we __ cutting down the rainforests.〔06年〕
A stopped B had to stop C shall stop D stop
as尽管，虽然，引导让步状语从句，从句中用would have done表示假设，可以是说话人的语气变得十分委婉，真诚。
例如：
52. Much as ____, I couldn’t lend him the money because I simply didn’t have that much spare cash.〔99年〕
would have liked to would like to have
should have to like should have liked to
考点10. if only表示要是…就好了相当 与wish, as if/as though 的用法。
与现在事实相反：动词过去式
与过去事实相反: had + done
与将来事实相反： could/would + do
例如：
52. If only I __play the guitar as well as you! 〔06 年〕
A would B could C should D might
备考1. would rather或would sooner后跟宾语从句，从句中使用一般过去式或过去完成式分别表示对现在或过去的虚拟，表示"宁愿*人作*事〞
例如：
The manager would rather his daughter ____ in the same office now.
not worked to work
not work not work
,for fear that引导的状语从句。在lest, for fear that等引导的状语从句中，通常用"(should +)原形动词"这一虚拟语气形式
例如：
The mad man was put in the soft-padded cell lest he ________ himself.
injured injure
专四语法考点串讲之二 情态动词
考试中，情态动词局部重点测试以下容：
〔1〕情态动词+行为动词完成式
〔2〕*些情态动词的特殊用法
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1. must have v-ed
must have v-ed 表示推测过去*事"一定〞发生了。其否认形式为：can’t / couldn’t have v-ed, 表示过去不可能发生*事。
例如：
Since the ditch is full of water, it must have rained last night.
2. could have v-ed 表示推测过去*动作"很可能〞发生了
3. may / might have v-ed 表示推测过去*事"也许〞 比 might 表示的可能性在说话人看来稍大些。
to / should have v-ed 和 ought not to / shouldn’t have v-ed 用于对已发生的情况表示"责备〞、"不满〞，分别表示"本应该…〞和"本不应该…〞表示应完成而未完成的动作用于完成时中的否认句，表示不应完成但已做的动作
’t have v-ed 表示过去做了*事，但没有做的必要， 意为"本没必要…