7：40 forty minutes past seven（7点经过40分）
twenty minutes to eight （8点还差20分）
3:45 forty-five minutes past three
a quarter to four
5：30 half past five
half to six
9:40 forty minutes past nine
twenty minutes to ten
6:26 twenty-six past six
four minutes to half past six
8：00 eight o' clock
eight
10:20 twenty minutes past ten
ten minutes to half past ten
第一种最准确,第二种有点不太确定.