Swallows fly to the south before winter comes .中文,为什么用comes而不用will come ,或is coming,
或Is going to come
人气：462 ℃ 时间：2020-04-01 23:09:04
解答
因为这句话说的是一般情况,普遍规律,这种都用一般式.未冬前燕南飞,所有燕子都这样,而非一个具体事例中的个别情况.
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