3:30 - It's half past three.
1:15 - It's a quarter past one.
6:40 - It's twenty (minutes) to seven.
2:05 - It's five (minutes) past two.
10:50 - It's ten (minutes) to eleven.
7:10 - It's ten (minutes) past seven.
9:55 - It's five (minutes) to ten.
6:00 - It's six o'clock.
12:20 - It's twenty (minutes) past twelve.