9 00 It's nine o'clock
8 05 It's five (minutes) past eight
15 10 It's ten (minutes) past three
18 15 It's a quarter past six
20 20 It's twenty (minutes) past eight
6 25 It's twenty five (minutes) past six
10 30 It's half past ten
11 35 It's twenty five (minutes) to twelve
12 40 It's twenty (minutes) to one
13 45 It's a quarter to two
14 50 It's ten (minutes) to three
17 55 It's five (minutes) to six