They haven't decided if they will go to Beijing
为什么要用will
而不说if they would?
人气:392 ℃ 时间:2019-10-19 03:37:54
解答
答:主句的时态如果是现在时态(包括一般现在时,现在进行时,现在完成时,等等),从句时态任意.只有当主句时态是过去时态时(包括一般过去时,过去进行时,过去完成时),从句是态必为过去时态(真理除外),这就叫“主过从过”,时态一致,真理不变.主现从便.
现在完成是属于现在时态.
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