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模块四 Module IV Modern life《Grammar and usage(1)： Modal verbs： general introduction》集体备课PPT课件优质课下载
3. Apply these rules to the exercises
4. Practice and examination
情态动词的常见考点：
1.can和could (could为can的过去式) 的基本用法
(1)表示能力。 He can speak English better than you.
(2)表示可能。在疑问句和否定句中表示“怀疑”“猜测”或“可能性”。Can this green bike be Liu Dong’s?
在肯定句表示：理论上或逻辑判断上的可能性。“可能会、有时会” An experienced driver can have an accident
at times.
(3)表示“许可” You can (may) go home now.
(4)表示语气委婉，可用could代替can，这时could不再是can的过去式。 Could you come again tomorrow?
Yes, you can/may .
(5)can和be able to都可表示能力，can有现在式和过去式，
He will be able to do the work better.
特别说明：
(1) can和be able to辨析
表示在过去某时的某一场合经过一番努力，终于做成了某事，不用could，而用was/were able to来表示。
这时，was/were able to do=managed to do
=succeeded in doing
1. After the accident it was a long time before she was able to walk again.
2. The fire was very big, but most people were able to escape from the building.
(2) 固定句型①cannot ....too... can't....enough...
表示“无论怎么……也不（过分）﹨越....就越...”
You cannot be too careful.
You cannot be careful enough.
② can’t help doing