It's seven o'clock in the evening.It'time()dinner.A.in B.for

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It's seven o'clock in the evening.It'time()dinner.A.in B.for C.at
请说明为什么

It's seven o'clock in the evening.It's time (B.for) dinner.
现在是晚上七点.到吃晚餐的时间了.
It's time for sth,到了做某事的时间.这里要用介词for表示“对于……”.
再问：为什么不能用to呢？^_^
再答：用to的时候是用的动词不定式，而不是动词。这句话应该这么表达： It's time (to have) dinner. 也就是说to要和动词原形一起用。

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