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 [ By the time ]是連接詞，假如它引導的子句是描述未來，主要子句要用未來完成式。例句如下：

By the time they are released, they will have learned some skills to begin their new lives

[ By the time ]引導的子句也可以描述過去，主要子句要用過去完成式。例句如下：

By the time I finished my homework, my young brother had gone to bed.

除[ By the time ]的句型外，還有另一類似句型：

[ By + 未來時間, 主詞 + 未來完成式 … ]

例句如下：

a) By the year 2050, the world will have lacked for enough food.

By the time 現在式，未來完成式 By the tme 過去式，過去完成式 By the 未來時間，未來...
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 [ By the time ]是連接詞，假如它引導的子句是描述未來，主要子句要用未來完成式。例句如下：

By the time they are released, they will have learned some skills to begin their new lives