一、 对比选择。

1. ① —Can / Could I use your dictionary?

       —Yes, you ________.

   ② Tim ________ go to the dance and had a wonderful time last night.

A. can; could       B. can; was able to    

C. could; can       D. could; was able to

2. ① I suggested that the girl ________ go to the forest alone.

   ② Tom, you are late for nearly 3 hours. You ________ have arrived here in the morning.

A. should not; must B. ought not; must

C. not; ought to    D. will not; should

3. ① The ground is wet this morning. It must have rained last________night, ________?

   ② He must have waited for a long time, ________?

   ③ The man must be sleeping at home at this time, ________?

A. didn't it; hasn't he; doesn't he

B. didn't it; hasn't he; isn't he

C. hasn't it; didn't he; isn't he   

D. hasn't it; hasn't he; isn't he

4. ① Look at the footprints. The murderer ________ here.

   ② I ________ the final exam, but I didn't study seriously.

A. must have come; could have passed   

B. might have come; could have passed

C. could come; should have passed  

D. ought to have come; could passed

二、 单句改错。（每句有一处错误）

1. The thief has caught climbing over the garden wall.

2. Can you tell me how long have you come back home?

3. I remembered the whole thing as if it was happened just yesterday.

4. The time come when my words come true.

参考答案：

一、 1. B 2. C 3. B 4. A

二、1. has→was。

    2. come→been。

    3. 去掉was。4. 在come前加will。