Как по будет 7: 00, 7: 10, 7: 30, 8: 00, 10: 00, 10: 20, 15: 00, 15 30.

7:00- It`s seven o`clock.
7:10-It`s  ten past seven.
7:30-It`s half past seven.
8:00- It`s  eight o`clock.
10:00-It`s  ten o`clock.
10:20- It`s  twenty past ten.
15:00-It`s  three o`clock.
15:30- It`s  half past three.