D.情态动词和虚拟语气。

　　a.情态动词

　　1.复习情态动词的基本用法，注意must,can,should,shall,would 一般和特殊词义和may well ,might as well的意思。

　　2.注意情态动词表示判断时的时态语态。

　　3.情态动词用于虚拟语气

　　b. 虚拟语气

　　复习虚拟语气的基本用法，掌握条件句的倒装，混合条件句的虚拟语气，含蓄条件句的虚拟语气。以及主语从句，宾语从句，同位语从句和其他句型的虚拟语气。

　　1.. Bob would have helped us yesterday, but he-_______

　　A. was busy B. is busy C. had been busy. D. will be busy

　　答案：A

　　2.But for their help,we ________ the progran in time.

　　A. can not finish b,will not finish c. had not finished d. could not have finished

　　答案：D.

　　3... ---Sorry, Professor Smith. I didn't finish the assignment yesterday.

　　---Oh, you have done it as yesterday was the deadline.

　　A. must B. mustn't C. should D. shouldn't

　　答案：C

　　4.. --The weather has been very hot and dry.

　　--Yes. If it had rained even a drop, things would be much better now! And my vegetables .