написать время по английски: 2:45,11:00,16:30,21:15,13:30,7:00,9:15,14:45.

2:45 - a quarter to three 
11:00 - eleven o'clock
16:30 - half past four
21:15 - a quarter past nine
13:30 - half past one
7:00 - seven o'clock
9:15 - a quarter past nine
14:45 - a quarter to three