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注意时态的变化：在一般情况下，如果从句的谓语动词用一般过去时，主句的谓语动词用过去完成时；如果从句的谓语动词用一般现在时，主句的谓语动词用将来完成时。例如：
By the time you came back, I had finished this book.
到你回来时，我已经写完这本书了。
By the time you come here tomorrow, I will have finished this work.
你明天来这儿的时候，我将已经完成此工作了。
由each time, every time等引导的时间状语从句。
Each time he came to Harbin, he would call on me.
他每次来哈尔滨，总是来看我。
Whenever that man says“To tell the truth”, I suspect that he's about to tell a lie.
每当那个人说“说实在话”的时候，我猜想他就要说谎了。
You grow younger every time I see you.
每次遇到你，见你更年轻了。
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