新概念英语（英语初阶）第1册139页 When were they there?他们是什么时候在那里的?4组分别前面1个

第一行：
---When were Sam and Penny at the stationer's?
---They were at the stioner's on Monday.
第二行：
---When were you and Susan at the office?
---We were at the office on March 23rd.
第三行：
---When were you and Penny in Australia?
---We were in Australia in July.
第四行：
---When was I in India?
---You were in India in 1985.
每一行一个句型.