b. You can go there tomorrow.
c. Can I borrow your car for today ?
2.在提建议时, 可用Can I / you ?
a. Can I buy you a drink ?
3.表示会, 能, 相当于be able to
a. He can speak English.
b. Can you play tennis ?
c. Little Tom cant move the big box.
4.在疑问句中表示怀疑, 不确定或不会有的情况, 即否定的推测
a. Can it be true ? 这是真的吗?
b. Can it be true that he has passed the exam ? 他真的通过考试了吗?
5.cant / couldnt在陈述句中可表示肯定不, 一定不的意思
a. He cant be in the room right now.
b. It cant have rained last night, for the ground is dry.
6.cant / couldnt help doing sth表示不得不,忍不住做某事
a. People couldnt help laughing at the foolish emperor.
7.can / be able to do的区别:
①.be able to可用于各种时态, 而can只有现在时can和过去时could
②.be able to可以和另一个不完全动词连用, 如should be able to (应该能够), must be able to (必须能够)等, 而can则不可以这样用
③.强调能力时, 多用be able to
a. The patient was soon able to sit up and read.
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