此处为何使用since which year？

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解决时间 2021-03-02 08:58

提问者网友：风月客
2021-03-02 04:30

Lily was admitted by a famous unversity in 1990,since which year we have never heart from him. 1、直接改成since which 用which自己代1990行么？2、改since when 成么？3、为何不能使用after which year？似乎要从时态上判断介词用since，但不知如何判断，请解释。谢谢

最佳答案

五星知识达人网友：青尢
2021-03-02 06:07

Lily was admitted by a famous unversity in 1990,since which year we have never heart from him.
1、直接改成since which 用which自己代1990行么？答：不行。因为which在此【做定语】修饰year。
2、改since when 成么？答：不成。因为since是介词，后面不能接副词或连接副词。
3、为何不能使用after which year？答：因为since引导的时间是【从过去延续到现在】，刚好与【现在完成时have never heart from him相吻合】。

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1楼网友：一叶十三刺
2021-03-02 07:12

since last year since后面加时刻 for后面加一段时间

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