Question

she went to America two years ago,since when i

she went to America two years ago,since when ihaven't heard from her any more这句话中two years ago是先行词 逗号后的是非限制性定从 我总觉得后面很像状语啊…

Answer 1

的确，看到从句里面有since，when会让人觉得这个从句是状语从句。但是区分定语从句和状语从句的关键是看从句修饰的是主句的哪些成分。实际上，从句里的when强调的是“two years ago“这个时间点，所以这个是定语从句。

删掉when，把主句和从句位置调换，你就可以得到一个原因状语从句：Since she went to America two years ago, I haven't heard from her any more.

删掉since, 把从句时态改成一般过去时(换一个表达），你就可以得到一个时间状语从句： She went to America two years ago when I out of touch with her.

希望可以帮到你：）

追问

谢谢你^_^能请你再帮忙解答一道问题吗 我会加悬赏的(๑'ᴗ')