十一点五十,十一点十五,十一点四十五,六点半.英文.

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eleven fifty/ten to twelve
eleven fifteen/a quarter past eleven
nine o'clock
six o'clock
seven o'clock
twelve o'clock
three o'clock
eighteen o'clock/six o'clock p.m.
twenty-one o'clock/nine o'clock p.m.

1.ten to twelve
2.a quarter past eleven
3.a quarter to twelve