宾语从句 主句是过去时态 从句一般用过去时某一时态。例：
He asked why they would leave in a hurry.
又例：I have heard of this story before.是现在时，但加过去时主句后，从句时态也须从现在完成时变为过去完成时。He added that he had heard of that story before.
例外： 主句是过去时，从句是真理或公理时，用一般现在时。
如： Teacher told us light is faster than sound.
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