don't have to do sth 是否等于don't need to do sth 和needn't do sth
问题描述：
don't have to do sth 是否等于don't need to do sth 和needn't do sth
答
don't have to do sthdon't need to do sthneedn't do sth一般来说是一样、并可互换的The teacher says you don't have to do itThe teacher says you don't need to do itThe teacher says you needn't do it异曲同...