The first lesseon star at 9 and 10o`clock.

Дальше по образцу подставляешь.

The first lesson began 10 min past 8

The first lesson began 20 min to 10

The first lesson began a quarter past 10

The first lesson began 15 mim to 11

The first lesson began 35 min past 10

The first lesson began 5 min 12

The first lesson began 25 min to 2

The first lesson began 5 min 2

The first lesson began 20 min to 3

The first lesson began 10 min 3