cannot can't couldn't mustn't的问题

问题描述:

cannot can't couldn't mustn't的问题
1.cannot = mustn't 是不准?那can't呢?
2.can是不能够,may是不可能 对不?
3.cannot can't couldn't之间的不同

cannot是“不能”或“不可能”
mustn't是“不准”或“不要”(用于告诫)
can是“能够”或“可能”
may not 是“可能不”
cannot=can't couldn't是can't的过去式