7. Without your help, we________ so much.

　 　　 A. won ' t achieve　　　 　　　　　　　　　　　　　 B. didn ' t achieve

　 　　 C. don't achieve　　　 　　　　　　　　　　　　　　　 D. wouldn't have achieved

6. I ________ him the answer ________ possible, but I was so busy then.

　 　　 A. could tell; if it had been　　　　　　　　　　　　　 B. must have told; were it

　 　　 C. should have told; had it been　　　　　　　　　 D. should have told; should it be

5. Were I to do it, I ________ it some other way.

　 　　 A. will do　　　　　 B. would do　　　　　　　 C. would have done　 D. were to do

4. Mary is ill today. If she _____ , she ____ absent from school.

　 　　 A. were not ill; wouldn' t be　　　　　　　　　　　　 B. had been ill; wouldn't have been

　 　　 C. had been ill; should have been　　　　　　　　 D. hadn't been ill; could be

3. I didn’t know his telephone number. ____ it, I ____ then.

　　　 A. Had I known, would ring him up　　　　　　 B. Should I know, would have rung him up

　 　　 C. If I knew; would ring him up　　　　　　　　 D. Had I known; would have rung him up

2. If they ____ earlier than expected, they ____ here now.

　　　 A. had started, would be　　　　　　　　　　　　　　　　　 B. started, might be

　　　 C. had started, would have been　　　　　　　　　 D. will start, might have been

1. If I ____ where he lived, I ____ a note to him.

　　　 A. knew, would　　　　　　　　　　　　　　　　　　　　 B. had known, would have sent　　

C. know, would send　　　　　　　　　　　　　　　　 D. knew, would have sent

5、虚拟语气在简单句中的用法

(1)情态动词的过去式用于现在时态时，表示说话人的谦虚、客气、有礼貌，或委婉的语气，常见于日常会话中。如: It would be better for you not to stay up too late. 你最好别太晚睡觉。

(2)在一些习惯表达中。如: I would rather not tell you. 我宁愿不告诉你。

(3)用“may + 动词原形”表示"祝愿"、"但愿”，此时may须置于句首(多用于正式文体中)。如：May you be happy!祝你快乐！May good luck be yours.祝你顺利。 练习、虚拟语气

4、虚拟语气在定语从句中的用法：在"It is time (that) …"句型中，定语从句的谓语动词常用虚拟语气表示将来，动词形式一般用过去式，意思是"该干某事的时候了"。如: It’s (high) time we did our homework. 我们该做作业了。

3、虚拟语气在状语从句中的用法

(1)在带有even if/ even though引导的让步状语从句的主从复合句中，主句和从句都用虚拟语气，动词形式与含有非真实条件句的虚拟语气相同。如: Even if he had been ill, he would have gone t his office. 即使生了病，他俩去办公室。

　 　 (2)由as if或as though引导的状语从句表示比较或方式时。从句谓语形式为动词的过去式(be用were)或 “had十过去分词”。如: He treated me as if I were a stranger. 他那样对待我，好像我是陌

生人似的。She talked about the film as if she had really seen it. 她谈论那部影片，就好像她确实看过一样。

　 注:如果表示的事情可能会发生，那么方式状语从句中的谓语动词可用陈述语气。

(3)在in order that或so that引导的目的状语从句中，谓语动词多用 “could或might(有时也用should)+ 动词原形”。如: Mr green spoke slowly so that his students could (might) hear clearly. 格林先生说得很慢，好让学生听清楚。