can't与couldn't区别,做题初三总是好两个一起来,怎么区分,特别用could I提问时分不清,

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can''t与couldn''t区别,做题初三总是好两个一起来,怎么区分,特别用couldI提问时分不清,can''t与couldn''t区别,做题初三总是好两个一起来,怎么区分,特别用couldI提问时分不

can't与couldn't区别,做题初三总是好两个一起来,怎么区分,特别用could I提问时分不清,
can't与couldn't区别,
做题初三总是好两个一起来,怎么区分,特别用could I提问时分不清,

can't与couldn't区别,做题初三总是好两个一起来,怎么区分,特别用could I提问时分不清,
你说的对有这样子的经历
can't/couldn't表示推测时,意思是“不可能...”,语气非常坚决的否定推测.
根据动作发生的时间,一般分为以下三种情况：
1）进行式（对正在发生的事情的否定推测）：can't be doing sth
如：It's already ten o'clock.My father can't be sleeping now.
2）完成式（对过去的动作的否定推测）：can't/couldn't have done sth
如：He is at schoool,so he can't/couldn't have stayed up last night.
3）一般式（对现在/将来情况的否定推测）：can't do sth
如：Your answer can't be true.
can/could表示推测时一般只用于否定句/疑问句,但是也可用于肯定句,只是比较少见.
其中could不表示过去式,而表示可能性较小.
如：I think the work can be completed ahead of time.我认为这项工作能提前完成.

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