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、虛擬語氣在簡單句中的用法

(1)情態(tài)動詞的過去式用于現(xiàn)在時態(tài)時，表示說話人的謙虛、客氣、有禮貌，或委婉的語氣，常見于日常會話中。如: It would be better for you not to stay up too late. 你最好別太晚睡覺。

(2)在一些習(xí)慣表達中。如: I would rather not tell you. 我寧愿不告訴你。

(3)用“may + 動詞原形”表示"祝愿"、"但愿”，此時may須置于句首(多用于正式文體中)。如：May you be happy!祝你快樂！May good luck be yours.祝你順利。 練習(xí)、虛擬語氣

4、虛擬語氣在定語從句中的用法：在"It is time (that) …"句型中，定語從句的謂語動詞常用虛擬語氣表示將來，動詞形式一般用過去式，意思是"該干某事的時候了"。如: It’s (high) time we did our homework. 我們該做作業(yè)了。

3、虛擬語氣在狀語從句中的用法

(1)在帶有even if/ even though引導(dǎo)的讓步狀語從句的主從復(fù)合句中，主句和從句都用虛擬語氣，動詞形式與含有非真實條件句的虛擬語氣相同。如: Even if he had been ill, he would have gone t his office. 即使生了病，他倆去辦公室。

　 　 (2)由as if或as though引導(dǎo)的狀語從句表示比較或方式時。從句謂語形式為動詞的過去式(be用were)或 “had十過去分詞”。如: He treated me as if I were a stranger. 他那樣對待我，好像我是陌

生人似的。She talked about the film as if she had really seen it. 她談?wù)撃遣坑捌�，就好像她確實看過一樣。

　 注:如果表示的事情可能會發(fā)生，那么方式狀語從句中的謂語動詞可用陳述語氣。

(3)在in order that或so that引導(dǎo)的目的狀語從句中，謂語動詞多用 “could或might(有時也用should)+ 動詞原形”。如: Mr green spoke slowly so that his students could (might) hear clearly. 格林先生說得很慢，好讓學(xué)生聽清楚。