介词的用法表示时间的介词in指在较长的一段时间内,后接大于一天的时间单位名词
eg: in August/ in 2015/ in winter/ in the 21st century/ in his life后接时间段,如果用于将来时,译为“…之后”
如果用于一般过去时,译为“在…之内”
eg:I will be back in 3 hours
他 3 小时以后回来
He came back in 3 hours
他在 3 小时以内就回来了
泛指在上午,下午或晚上
eg: She seldom reads in the evening
I usually go to the market to buy vegetables in the morning
at后接时间点,即在…点钟,时刻eg: at six o’clock/ at noon/ at that time/ at the beginning of…on表示在具体的某一天
eg: on my birthday/ on the following day/ on that day表示在具体某一天的上下午或晚上
eg: on Sunday morning/ on the night of August 10/ on a sunny afternoonduring表示在某段时间内,某一动作自始至终地进行
eg: During the meal we talked about the TV play
The shop was closed during the whole three months
for后接时间段,表示动作持续的时间
表示延续到现在已经多长时间
eg: They have lived in China for two years
表示过去的某个动作持续过多久
eg: They lived