答案填:you would know
本句是一个混合虚拟语气,也叫错综条件句。当虚拟条件句中的主句和从句涉及的动作发生的时间不一致,这时主句和从句的谓语形式应按照各自动作发生的实际时间来表达。本句前面从句部分与过去事实相反,用过去完成时,后面主句部分与现在事实相反,用would+动词原形。又如:
If you hadn't watched TV yesterday, you wouldn't be so sleepy now. 如果你昨天不看电视,你现在也就不会这么困了。(从句yesterday说明过去,主句now说明现在)
If they had left home early this morning, they would arrive in half an hour. 如果他们今天一早就离开家的话,再过半小时他们就该到了。(从句说明过去,主句说明将来。)
If you hesitated this moment, you might suffer in the future. 如果你此刻犹豫不决,你将来会吃苦头的。(从句说明现在,主句说明将来)
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