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.
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.
Fifteen minutes tenth
twenty minutes to an hour
ten minutes to six
half of the fifth