定语从句语序与时态要求（定语从句的时态怎么确定）

英语句子的语序有陈述语序和疑问语序(倒装语序)。

定语从句的语序要用陈述语序，如果是疑问句，主句用疑问语序,从句用陈述语序。

定语从句的时态可以根据主句和从句的需要，各自用自己所需用的时态。

例句：

1.This is the book that/which I borrowed from the library yesterday.

2.Is this the boy who won the first prize in the competition?

3.This is the factory where his father worked many years ago.

定语从句陈述语序，时态一般与主句一致