Как по сказать одиннадцать часов , 15 минут десятого , без двадцати час , без десяти шесть , половина пятого

It's eleven o'clock.

It's a quarter past nine.

It's twenty (minutes) to one.

It's ten (minutes) to six.

It's half past four.

Eleven hours
Fifteen minutes tenth

twenty minutes to an hour

ten minutes to six

half of the fifth