have to 可以看成一个整体,即一个动词,变成疑问句时必须用助动词来提问,和一般的动词一样用法,而must则是一个情态动词,在句子里可以直接放到句首来提问,无须再加助动词。例如:Do I have to get home at nine?我必须要在9点到家吗?/ Must I get home at nine?我必须要在9点到家吗?
have to 变一般疑问句时在句首加DO 2 把must 提到句首。如 They have to clean the floor . -> Do they have to clean the floor ? They must clean the floor .-> Must they clean the floor ? 加油!不明白再问!如果帮到你,请采纳,谢谢!
第2个回答 2020-04-04
你好! have to 的一般疑问句 用助动词 do 或者 does 开头。 must 的一般疑问句直接用 must 开头。 例如:Do you have to go now? Must I go now? 打字不易,采纳哦!