When did you come to BJ?
| 定语 | 状语从句（一般过去时） | 一般过去时 + 状语从句(过去完成时) |
|---|---|---|
| I came to BJ in 2007. | I came to BJ when I graduated from university in 2007. | I came to BJ after I had graduated from university in 2007. |
过去完成时 + 一般过去时 描述两件事情发生的先后顺序。
When did you get married?
| 定语 | 一般过去时 + 状语从句(过去完成时) |
|---|---|
| I got married in 2009. | I got married after we had been together for three years. 我们已经在一起了三年(先)，后才结婚。 |
When did you go abroad?
| 定语 | 一般过去时 + 状语从句(过去完成时) |
|---|---|
| I went abroad the year before last. | I went abroad after I had got the offer from Harvard University. 拿到了哈佛大学的录取通知(先)，后才选择出国。 |
练习题（When did …? / Did …?）
Q: When did you go home?
A: I finished my work first. Then I went home.
Q: Did you start your new job?
A: Yes, but I had an interview first.
Q: When did she get married?
A: She graduated from college first.
Q: Did your parents move to the city?
A: Yes, but they sold their house first.
Q: When did you buy a smartphone?
A: I saved enough money first.
Q: Did he call you?
A: Yes, but he finished his work first.
Q: When did you meet your best friend?
A: I joined the new school first.
Q: Did the train leave?
A: Yes, but all the passengers got on first.