关系副词when主要⽤于修饰表时间的名词，同时它在定语从句中⽤作时间状语。下⾯为⼤家介绍定语从句中when的⽤法，希望对你有⽤！ 定语从句中when的⽤法
when：当主句中的先⾏词(即主句中被后⾯定语从句修饰的'词)是表⽰时间意义的名词时,它只能作定语从句的时间状语,放在定语从句句⾸.如果定语从句的引导词是作该定语从句的主语或宾语,则要改⽤关系代词that或which来引导.例如： The days when we used foreign oil are gone.我们⽤洋油的⽇⼦⼀去不复返了.
I'll never forget the day when I was born.(=I'll never forget my birthday.) 我永远不会忘记我出⽣的⽇⼦. It happened in November when the weather was wet and cold.这事发⽣在天⽓⼜湿⼜冷的⼗⼀⽉.
In the years that (which) followed,Marx kept on studying English and using it.在这之后的⼏年中,马克思继续学习和使⽤英语.(that作定语从句\"that followed\"的主语)
The day (that) I always remember in all my life is my birthday.我⼀⽣中最难忘的⽇⼦是我的⽣⽇.(that作定语从句\"that I always rememberin all my life\"的宾语,that可以省略) 追问：
He will never forget the days \"when\" he stayed with his students 这句怎么理解？为什么⽤when 追答：
the days 这个先⾏词在定语从句 he stayed with his students中没做主语，也没作宾语⽽是作状语，先⾏词做时间状语时⽤when【定语从句中when的⽤法】
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