1:50(2点还差10分) ten minutes to two
4:15 (4点经过15分) a quarter past four a quarter =15分
6:30 half past six half=30分
8:45(9点还差15分) a quarter to nine
11:55 (12点还差5分) five minutes to twelve
the ten minutes to two
the quarter past four
half past six
the quarter to nine
the five minutes to twelve