Как по будет 7-00 7-15 8-10 8-30 14-50 15-00 15-20 16-50 18-00 18-30 20-30 21-30

7-15 - quarter past seven
8-10 ten past 8 
8-30 half past 8 
14-50 ten to 3 
15-00 three o'clock
15-20 twenty past 3 
16-50 ten to 5 
18-00 6 o'clock
18-30 half past 6 
20-30 half past 8 
21-30 half past 9