问题: 句型分析
M:This toothache is killing me.
W:If I am right,this is the third time you've
had it this month.
M:You are right.I'm fed up with it.
哪位高手能帮我分析一下W说的这句话的结构
解答:
这是含有一个条件句的复合句。主句是this is the third time you have had it this month.主句的结构可视为一个固定的句型，即：this is the first (second ..., last) time + 从句 （从句中的时态一定是现在完成时）；如果是this was the first time +从句 （则从句的时态必须是过去完成时）
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