can,can't,must,mustn't,needn't,be allowed to,have to,don't have to的区别
问题描述：
can,can't,must,mustn't,needn't,be allowed to,have to,don't have to的区别
答
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...