表示钟点
半小时用half，一刻钟用a quarter，半小时以内用past，超过半小时用to。
08:00 eight o’clock或eight
09:15 nine fifteen或a quarter past/after nine
02:30 two thirty或half past/after two
05:45 five forty-five或a quarter to six
14:15 fourteen fifteen=2.15 p. m.
23:05 twenty-three oh five
24:00 twenty-four hundred hours=midnight
