M: I'm looking for my sweater. W: It's here, here you are. What was said before this conversation?
----
Answer: W: What are you doing, Jay?

W: Ok, it's about 500 km farther than from Guangzhou to Shanghai. What was said before this conversation?
----
Answer: M: It's about 2300 km by train from Guangzhou to Beijing.

M: Because the weather report says it will be rainy on Sunday. What was said before this conversation?
----
Answer:
W: Hey, why can't we go to see the play in Sunday?