问题描述：
The old man would sit in front of the house,waiting for his son to come to visit him.
The old man would sit in front of the house,waiting for his son to come to visit him,句子里waiting for his son 为什么不是 wait for his son,因为前边的时态是过去将来时,
The old man would sit in front of the house,waiting for his son to come to visit him,句子里waiting for his son 为什么不是 wait for his son,因为前边的时态是过去将来时,
问题解答：
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