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模块四 Module IV Modern life《Grammar and usage(2)： Modal verbs： comparisons》集体备课PPT课件优质课下载
某一动作或状态
“可能”、“可以”、“需要”、“必须”或“应当”
人称和数
单独作谓语
疑问式
否定式
can could
may might
shall should
will would
must
ought to
dare (daren’t)
need (needn’t)
modal verbs
I.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. A computer ______ think for itself; it must be told what to do.
A. can’t B. couldn’t C. may not D. might not
A
2. The fire spread through the hotel very quickly but everyone ______ get out.