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请问,是When is it open?还是When does it open?

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请问,是When is it open?还是When does it open?
它们的答句都是It's open from 8a.m to 9p.m.
其中一句问句是When is it open?这是书上的问句.
还有一句问句是When does the library open?这是试卷上的问句.
请问这两个问句有什么不同?为什么一个要用be动词,一个要用助动词?
请问,是When is it open?还是When does it open?
你好,同学：

这两个句子都是正确的,第一个open是形容词,放在be动词后面,构成系表结构；第二个open是实义动词,开放的意思,所以变成问句时用助动词does,这两个句子的意思是一样的,都是问：“它什么时候开放?”




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