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 in China for two years.表示某一动作将要持续多久。eg: They will stay in China for two years.since译为自从，后接过去的时间点，表示某一动作自过去某时延续至今，做现在完成时的时间状语。eg: I haven’t written home since Christmas.afterafter 后接时间段，用于过去时。 eg: They got married after a year.after 后接时间点，用于将来时。eg:He will arrive after 3 o’clock.by“不迟于某时”，包括某时在内。eg: I will finish the work by Friday. (包括星期五)before“在某时之前”，不包括某时在内。eg:I will finish the work before Friday. (不包括星期五)表示地点的介词on指在某物的表面上，与物体表面接触，反义词为 beneath。eg: A lovely cat is lying on the table. The ground beneath their feet is soft.in在…之上，暗示占去了某物的一部分。eg: There is a hole in the wall. He is lying in bed. There is a bird i...
