3:30用英语怎么说三种

"three thirty" (数字读法)
来源：直接按照数字读出。
例句：The meeting starts at three thirty. (会议在三点半开始)
"half past three" (半点读法)
来源：源自英国传统读法，表示时间已经过去了三点半。
例句：I will be home by half past three. (我三点半会回家)
"a quarter to four" (分钟数读法)
来源：源自英国传统读法，表示距离四点还有15分钟。
例句：I need to leave in a quarter to four. (我得在三点四十五分离开)