--Could you tell me when Mr. Li ______ in Beijing?--Sure. When he _____, I ’ll call you. 

 –Where is Mr. Smith? --He isn’t here. He ______ to England.

I will stay at home and read some books if it _________ tomorrow.

—How long have you lived here?—Since I _________.

 ---Let’s go fishing if it      this weekend.  --- But nobody knows if it      .