时间介词“at”
① 表示“某一具体时刻，钟点”
⑴ I get up at six thirty every morning.
(six thirty : 6:30，具体时刻; 钟点)
⑵ We will meet at the school gate at 8:00 in the morning.
(at 8:00 : 八点，具体时刻; 钟点)
⑴ 表示“某一具体时刻，钟点”
② 表示在特定的时间或节日
例子:
⑴ What do you do at Christmas?
(Christmas: 圣诞节，特定的时间和节日)
⑵ They were happy at that time.
(that time: 那个时间，特定的时间和节日)
⑵ 表示在特定的时间或节日
③ 表示“在中午、在夜晚、在周末”
例子:
⑴ at noon
⑵ at night
⑶ at the weekends
⑶ 表示“在中午、在夜晚、在周末时”
④ 表示“在...岁时”
例子:
⑴ At the age of nine, the boy could swim well.
⑵ At the age of three, she began to write.
