把I can swim改成否定名,一般疑问句,否定回答和肯定回答.情态动词在过去式中怎么用

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把I can swim改成否定名,一般疑问句,否定回答和肯定回答.情态动词在过去式中怎么用

把I can swim改成否定名,一般疑问句,否定回答和肯定回答.情态动词在过去式中怎么用
把I can swim改成否定名,一般疑问句,否定回答和肯定回答.情态动词在过去式中怎么用

把I can swim改成否定名,一般疑问句,否定回答和肯定回答.情态动词在过去式中怎么用
否定 I can't swim
一般疑问:Can you swim?
肯定回答:Yes,I can.
否定回答:No,I can't.
can的过去式是could

I can't swim.
Can I swim?
No,I can't.
Yes,I can.
can, will等情态动词一般不用于过去式
在过去式中用could.