1.can表示“能够”,can't是“不能” 2.must表示“必须,应该”,mustn‘t是“禁止”恰恰相反 3.needn't表示“不必要的” 4.be allowed to表示“被允许做某事” 5.have to表示“不得不,必须” don't have to 表示“不应该做某事”
6.must和have to都表示“必须”,must强调主观看法,have to强调客观情况.
can,can't,must,mustn't,needn't,be allowed to,have to,don't h
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