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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 already gone to Fengqiu .至于情态动词Must 和have to 区别,若是还有未涉及到的地方,恳请各位老师批评指正。谢谢! 李倩2016.10.10