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i can speak english 情态动词是什么作用?

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i can speak english 情态动词是什么作用?
i can speak english 情态动词是什么作用?
表达"能力".(体力、知识、技能、容量)
Can you lift this heavy box?(体力)
Mary can speak three languages.(知识)
Can you skate?(技能)
This hall can hold 500 people at least.(容量)
注:此时可用be able to代替.
No one is able to do it.(= No one can do it.)
区别:can(一般现在时)和could (一般过去式);而be able to通过be的变化则有更多的时态,它也可以用于不定式或与其他助动词或情态动词连用,can 或 could则不可.
I’m glad to be able to attend your wedding party.
She might be able to play the role.
I haven't been able to find any jobs.