一、表示时间的in,on与at1.在某年、月、季节、早、晚用in。如:in 2000,in April,in spring,in the evening……2.带有日期,后要用on。如:on July 2.1999在1999年7月2日on the morning of the 20th of May(强调指)在五月二十日的早晨3.在午间、夜间,在开始、末尾等要用at。如:at noon,at night,at the beginning,at the end,at the weekend,(on weekends),at Christmas(但是on Christmas Eve)4.注意in time(及时)与on time(准时)的区别 First, said the time in, on and at1. In a year, month, season, early, late in. Such as: in 2000, in April, in spring, in the evening ...... 2 with a date, after use on. Such as: on July 2.1999 on July 2, 1999 on the morning of the 20th of May (emphasis) on the morning of May 20 3. At noon, at night, at the beginning, at the end, etc. to use at. Such as: at noon, at night, at the beginning, at the end, at the weekend, (on weekends), at Christmas (but on Christmas Eve) 4. Note the distinction between time and on time