6:00 - it is six o'clock;
8:05 - it is five minutes past eight;
10:15 - it is quarter past ten;
7:25 - it is twenty five minutes past seven;
11:30 - it is half past eleven;
6:40 - it is twenty minutes to seven;
4:15 - it is quarter past four;
12:45 - it is quarter to one;
3:50 - it is ten minutes to four;
5:55 - it is five minutes to six.