they like ice cream /Do they like ice cream?/What do they like?/They don’t like ice cream.the must go home now./ Must they go home now?/When must they go home?/They mustn’t go home now.这两段对话 为什么第一个用do 第二个不用呢?
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they like ice cream /Do they like ice cream?/What do they like?/They don’t like ice cream.
the must go home now./ Must they go home now?/When must they go home?/They mustn’t go home now.
这两段对话 为什么第一个用do 第二个不用呢?
must是情态动词 所以在变形时可以直接把它当成do一样使用
must有必须的意思,而do有做的意思,在这must和do用法就不一样!
如果换成 Do they must go home now?When do they must go home?也是可以的。
但最后一个就不能变成They don't must go home.
因为mustn‘t 的意思是“绝对不能”,don't must 是不必(一般不能说don't must而要说don’t have to)。
must和do最好不要同时出现在同一个句...
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如果换成 Do they must go home now?When do they must go home?也是可以的。
但最后一个就不能变成They don't must go home.
因为mustn‘t 的意思是“绝对不能”,don't must 是不必(一般不能说don't must而要说don’t have to)。
must和do最好不要同时出现在同一个句子中,所以用must的时候一般不用do的形式。
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