1 Let's meet at five o'clock.
2 They are having dinner now.
3 Will you go to the library after classes tomorrow?
4 Did you get up at 7 o'clock this morning?
5 I didn't meet my best friend yesterday.
6 I have already done my household duties.
7 He didn't visit the British Museum.
8 We are talking about famous writers now.
9 We have already come there.
10 When I return, I shall call you then.