英語中情態動詞，比如：can(could)，may(might)，must，should 等等，雖然數量不多，但用途廣泛。情態動詞的過去式可以幫助說話的人表達對過去的推測外，還可表示過去沒有實現的可能性（即某事本來可以發生，卻沒發生）?？靵硖魬鹨幌履銓η閼B動詞的理解吧。

1. I’m not surprised he’s angry with you. You ____________ his laptop with asking yesterday.

a) shouldn’t have borrowed

b) shouldn’t borrow

c) couldn’t borrow

d) might not have borrowed

2. I’m surprised she’s not at home. She ____________ work an hour ago.

a) should leave

b) ought to leave

c) may have left

d) ought to have left

3. I wish I’d never told him my secret. He ____________ anyone or I’ll be really angry.

a) had better not have told

b) must have told

c) would not have told

d) should have told

4. It ____________ who broke the equipment. I wasn’t in the lab that day.

a) could have been me

b) must have been me

c) couldn’t have been me

d) mightn’t have been me

5. I’m sure he’s not ignoring you. It’s possible that he ____________ you yesterday.

a) could have seen you

b) saw

c) would see

d) might not have seen

6. I gave it everything I had. I ____________ any harder than I did.

a) couldn’t have tried

b) couldn’t tried

c) would have tried

d) shouldn’t have tried

答案

1) a, 2) d, 3) a, 4) c, 5) d, 6) a.