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情态动词学习笔记(4) 基本用法:许可(can、may、be a

情态动词学习笔记(4) 基本用法:许可(can、may、be a

作者: 猪猪一号 | 来源:发表于2020-02-11 23:26 被阅读0次

can 用于口头语

may 多用于书面正式语

can/may = be allowed to

例句:

you can use my car tomorrow
you are allowed to use my car tomorrow

you can leave now ,he may not leave.

否定句:

can not /may not

must not也可表示拒绝许可,但语气更强烈。

could/might 用来表示过去的许可

could/might/was allowed to 能表示过去一般的许可
要表达具体场合的某一个活动只能用was/were allowed to不能用could/might
例句:
they might have a break after lunch 那时,他们吃完午饭后是可以休息一会儿的

they were allowed to have a break after lunch 那次,他们吃完午饭后被允许休息了一会儿

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