表示能力: can, could, be able to
*be able to 能用于各种时态。
can / could 只能表示现在或过去的能力。
*was / were able to : “设法做成某事”
相当于
managed to do sth.
succeeded in doing sth.。
1. 表示能力、许可的情态动词的用法。 1. A computer ______ think for itself;
it must
be told what to do.
A. can’t
B. couldn’t
C. may not
D. might not 2. The fire spread through the hotel very quickly
but everyone ______ get out.
A. had to
B. would
C. could
D. was able to A
D
3. They will ______ run this machine on their own in three months. A. can
B. could
C. may
D. be able to 4. That big cinema ______ seat 2,000 people. A. can
B. should
C. ought to
D. is able to D
A
表示许可:
may / might,
can / could
* might, could 比较委婉, 一般多用于疑问句. * can, may 表达的语言比较随便. * 在以could, might 表示征询对方意见
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