should must need have to 的区别

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/13 14:51:15

should must need have to 的区别
为什么Must 的否定回答要用needn't
needn't不是不必要的意思吗应该等于not necessary 而为什么necessary 要用should来改写同意句不用must
乱了乱了谁来我、帮我整理一下

should,must,need,can都是情态动词,后面都只能跟动词原形,分别解释为应该,必须,需要,可以.
其中need可分为两类：一、need do,否定形式为needn't do,肯定回答为Yes,I need.否定回答为No,I needn't.二、need to do,否定形式为don't need to,肯定回答为Yes,I do.否定回答为No,I don't.
用must提问时,肯定回答要用must,否定回答要用need,比如：A:Must I do it now?B:Yes,you must./No,you needn't.
have to解释为不得不,后面跟动词原形.比如：I have to go now.

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