haveto和must的区别

1、小议情态动词Must 和Have to 的用法区别Must 和Have to二者均有“必须”的意思，其后均用动词原形形式。但是二者用法又有明显不同，下面将做详细说明：A:关于Must 的用法：1、Must 用来表示必须时，强调的是主观需要，发自自身内心的概念。2、Must 作为情态动词而言，没有人称、单复数和动词时态的变化。3、含有情态动词must的肯定句变为一般疑问句时，需要将must提前到句首，注意第一人称和第二人称的转换形式即可。对于一般疑问句的回答，其肯定回答要用Yes,主语+must。而对于其否定回答则不能用mustnt，因为mustnt表示不准、不应该，是一个表示命令性的禁止语气的

2、单词，而此处的语气是一种劝告、劝说的语气，所以只能用neednt或者是donthave to 进行回答。如：Must I finish homework this afternoon?Yes, you must.No, you neednt. or: you dont have to .4、含有情态动词must的句子要变为否定句只需要在must后面直接添加否定词not 即可，变为mustnt，如We students mustnt play soccer in the street .B:关于情态动词have to 的用法：Have to 也表示必须，但强调的是客观需要，有不得不、被逼无奈的做

3、某事。此词既有人称、单复数的变化、也有动词时态的变化。同时其否定形式和其疑问句形式均需要借助助动词do才可以进行变化。如：We have to stay in the classroom because we didnt finishour homework.She has to look after her mother at home.Does he have to go to bed now?Yes, he does./ /No, he doesnt .We dont have to clean the clean today.I will have to finish reading

4、the novel because my deskmate wants to get it this afternoon. C: must 还有表示“肯定性”猜测的语气，意思是“一定，肯定”的概念。 如：This book must be Toms because his name is on the cover of the book .The teacher must be in the office .The light is on now.She must have a camera because I often see her take photos.此时一定要注意表示“可能性”猜测语气（may）和“不可能性”猜测语气（cant）的用法。May: She may be our English Teacher.Cant: The man you saw in the street cant be Mr Smith . He has alre