Is the cup made of pure gold?为什么不是 does the cup made of pure gold?为什么会是is

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Is the cup made of pure gold?
为什么不是 does the cup made of pure gold?
为什么会是is

你这句话是疑问句,你想想看陈述句怎么说?
就是The cup is made of pure gold.那么问的时候就应该把is给放到句首
道理很简单,就好像我可以说It is a cup但是不能说It does a cup一样.那么问的时候就应当是Is it a cup?而不是Does it a cup,反之亦然
再说了,如果你问Does the cup made of pure gold?那别人怎么回答?难道是Yes,it does a cup或者Yes,it makes a cup吗?不行吧?

be made of 是固定表达,由...制成
这里是一个被动语态

be made of 是一个固定短语,陈述句是The cut is made of pure gold .

be made of 是固定词组

be made of是固定的搭配,而且此处应运用被动语态

be made of 必须是系词 语法 这句话变成陈述句就应该是the cup is made of pure gold. 总不能说the cup does made of pure gold 吧