"
7.(延边F)can…have done和can not have done表示对过去发生的行为的怀疑和不肯定。如:
He can not have taken away the magazine.
Can he have gone home?
(延边F)考场思维训练
1 (延边F)—I saw Mr. Smith at the West Beijing Station this morning.
—You
He' s still on holiday in Hawaii.
A. couldn' t have
B. mustn' t have
C. shouldn' t
D. needn' t
1.A解析:完整结构是You couldn’t have seen Mr.Smith…。表示对过去发生的动作的否定推测。
2 (延边F)—Did you walk all the way home by yourself?
—Yes, I did. But I guess I
A. needn' t
B. needn' t have
C. shouldn' t
D. may not have
2.B解析:表示过去做了没有必要做的事。
3 (延边F)—Lucy
have been to Mary' s wedding. They are the best friends.
—But she
for some reason, because Mary asked us why Lucy had missed her wedding.
A. would; couldn' t
B. should ; can' t
C. must ;wasn' t able to
D. must ; might not
3.c解析:前者表示对“过去”的肯定推测,后者指“过去”没.能去。
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