Question

have to,must,do not need,needn't的区别

Answer 1

have to 意为不得不,表示不是主观意义上的想要做什么

must 意思是必须 ,带有强烈的语气

do not 语气比较平和,意思是没有

need意为需要,比如l need a book.

needn't 意为不必,比如,一般用于否定回答must引导的疑问句,例如：Must l clean the room?No,you needn't/No,you don't have to.