Question

Which能不能指代时间?如.in 1999,since which.如果改成since

Answer 1

which 可以指时间,但since which不对

since后面常跟 时间状语,比如since then,since ten years ago,since last year,since when I was 14等

也有跟时间的 since 1994

since when 可以看成since then 在定语从句中的改写.

究竟为什么since which不对,我也不清楚,习惯上就这么用了.