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.