Как на будет словами: 7: 30 8: 30 11: 00 15: 00 18: 00 19: 00 21: 00

Seven : thirty.
Eight : thirty.
Eleven : zero.
Fifteen : zero.
Eighteen : zero.
Nineteen : zero.
Twenty - one : zero.

7:30 half past eight 8:30 half past nine 11:00 eleven o'clock 15:00 fifteen o'clock 18:00 eighteen o'clock 19:00 nineteen o'clock 21:00 twenty one o'clock