1、介词 介词是虚词，不能单独做句子成分，介词和它 后面的宾语构成介词短语。 介词短语可以做句子中的多种成分，可以表示 时间、地点、方位、方向等。 介词的定义 表示时间的介词 in表示较长的时间，如世纪，朝代，时代，年， 季节，月，早/中/晚等 in the 21st century, in the Tang Dynasty, in the 1980s, in 2018, in summer, in May in the morning/afternoon/evening in ones thirties/ in ones 50s, in ones life on表示具体某一天及某一天的早中晚 o
2、n May 1st, on Sunday morning, on a cold night in September, on Christmas Eve 表示时间的介词 表示时间的介词 at表示某一时刻或较短暂的时间 at 3:20 at the beginning/end of at noon/night/midnight/daybreak(黎明时分) at the age of at this moment 注意： 表时间的词前有this, that, last, next, every, some, one, any, each或all时通常 省略介词。 “自从以来”since, for
3、 since+时间点 for+时间段 常用于完成时 1.He has worked here since his graduation. 2.He has worked here for 3 years. 表示时间的介词 在之前 before 在之后 in, after “in+段时间” 常与将来时连用 “after+段时间” 常与过去时连用 “after+具体时刻” 句子用过去时、将来时均可 1.Please wait here. I will come back in a few minutes. 2.He came back from abroad after two years. 3.
4、He came/will come back after 2 oclock. 表示时间的介词 表示时间的介词 till和until 直到为止(肯定句) 直到才(否定句) 1.I will wait until/till seven oclock. 2.His mother couldnt buy him a piano until yesterday. 表示时间的介词 by 最迟在之前 I will start by 6 oclock. 比较: I wont start before 6 oclock. in表示较大的地方，如大城市、国家、洲等 at表示较小的地方，如门牌号、家、机场等 at
5、home, at Luolong District, at the airport in Shanghai, in China, in Asia 表示地点的介词 in表示在某一区域以内 on表示在某一区域以外，两地在方位上 相邻且接壤 to表示在某一区域以外，两地在方位上 相邻但不接壤 表示地点的介词 1.B is in the north of A. 2.C is on the north of A. 3.D is to the east of A. B A D C in on to 表示地点的介词 over under above below on 表示方位的介词 正上方，有接触面 斜上方
6、 正上方 不接触 斜下方 正下方 along/down 沿着，顺着 across 横过，横跨 through 通过，贯穿 表示方位的介词 across along through 1.There is a tree in front of the classroom. 2.Miss Wei is standing in the front of the classroom. 表示方位的介词 in front of 在外部的前面 in the front of 在内部的前面 _ Friday evening _ the 1980s _ the age of _ midnight _ the Ta
7、ng Dynasty _ last Sunday Exercises 1.Japan lies _ the east of China. 2.There is a bridge _ the river. onin atat in/ to over 3._ the windows of her house is a supermarket. 4. _ the chair there is a cat sleeping. 5.Her son was too fat to go_ the door. 6.He saw me and came to me _the road. Exercises Below Under through across Thanks.
