6:50 ten minutes to seven
7:10 ten past seven / ten after seven
8:15 a quarter past eight / a quarter after eight
9:20 twenty minutes past/after nine
10:25 twenty-five minutes past/after ten
11:30 half past eleven
2:45 a quarter to three
1:50 ten (minutes) to two
3:45 a quarter to four
5:40 twenty minutes to six
6:55 five minutes to seven
1:20 one twenty ; twenty minutes past one
4:30 four thirty; half past four
5:15 five fifteen ; a quarter past five
7:40 seven forty ; twenty minutes to eight
9:45 nine forty-five; a quarter to ten
10:50 ten fifty; ten minutes to ten
倒读规律：30 分钟或前的,用分钟数+ past or after + 时钟数
30 分钟后的,用 60minutes - 分钟数+ to + （时钟数+1）
exactly 30 minutes 用 half
15 minutes 用 a quarter
顺读 就是看着数字读.
这是我平常以及周围朋友的报时读法,不知道教科书里的是不是这样.