三、情态动词中应特别注意的典的型结构
They must be in the library, aren´t they? 他们一定还在图书馆，对吧？
They must have gone to the library, haven´t they? 他们一定去图书馆了，对吧？
They must have been to the library yesterday, didn´t they?
他们昨天一定去了图书馆，是不是？
Let me do it, will you? 让我来做，好么？
Let me help you, may I? 请让我帮你，可以吗？
Don´t move, will you? 请你别动！
Go quickly, can you? 你能不能快点？
Let´s go for a walk, shall we? 咱们去散步，好么？
He used to live in the countryside, didn´t/usedn´t he? 他过去住在农村，对吧？
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