can't ,一般情况下只当做情态动词来用,有以下用法：
1，an't的美式发音是[kænt]，英式发音是[kɑ:nt]。can't用法是后加动词原形。
解释：禁不住 ; 不得不 ; 不能 ; 不足
2，can't 为短语，不省略后为 can not.或cannot，后加动词原形
3，won't,当做助动词来讲
英 [wəʊnt] 美 [woʊnt]
解释：将不,不会(=will not)
将来时表将来 I won't go with you.
当做情态动词来用
表个人意愿,“不愿,不想”I won't make breakfast for him.
4，当做强调词来用I won't break up with her.
例句：
I won't encroach on your time any longer.我不会再占用你的时间了.
I won't be finished for another hour.我还得一小时以后才能完成.
Fretting about it won't help.苦恼于事无补.
So you won't be coming tonight,huh?那么你今晚就不来了吗,