cant釋義：不可能，不能，是情態動詞的否定式
The window can't open. 窗户設計的時候就不能打開，是固定死的。
doesnt是對一般現在時態第三人稱行為動詞的否定：
The window doesn't open. 窗户打不開。（純粹陳述客觀事實
can't是不可能的意思.
例：I can't move that box because it is so heavy.
don't是助動詞.
例：I don't know.
did't是don't的過去式，在一般過去式的句子中改否定句是常用到.
例：He worked out this problem by himself.
否定句是：He didn't work out this problem by himself.
couldn't是can't的過去式d也有時候表示委婉語氣.
例：Could you give me that pen?
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