1、在宾语从句中的运用
Lizzy asked John what the professor had said in class.
在课上,利兹问约翰,教授说了什么。(这里“said”的动作在“ask”之前)
2、在定语从句中的运用
Yesterday, I helped an old man who had lost her way.
昨天,我帮助了一个已经迷路的老人。(who引导的定语从句)
3、在以主语+had done, before/by+过去时间状语词组/从句中的运用:
Mr.Wanghad attended the conference and delivered a speech before he visited Yorkshire.
王先生在去约克郡之前已经出席了会议并发表演讲。(before引导的从句,一般过去时)