✔ 最佳答案
There are 2 ways to tell time, one is more formal, one is more conversational - seems like this is a homework assignment, so it is more safe to answer these time in the formal way. But anyways, I put down both versions for your reference, the first one is the formal one.
6:30
half past six OR six thirty
6:55
five minutes to seven OR six fifty-five
7:00
seven o'clock OR seven
7:31
twenty-nine minutes to eight OR seven thirty-one
12:45
fifteen minutes to one OR twelve forty-five
4:00
four o'clock OR four
4:30
half past four OR four thirty
Should help....