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 Mayin the morning/afternoon/eveningin ones thirties/in ones 50s,in ones lifeon表示具体某一天及某一天的早中晚on May 1st,on Sunday
2、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 since+时间点 for+时间段 常用于完成时1.He has worked
3、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.He came/will come back after 2 oclock.表示时间的介词表示时间的介词til
4、l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 home,at Luolong District,at the airport in Shanghai,in China,in Asia表
5、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.BADCinonto表示地点的介词overunderabovebelowon表示方位的介词正上方，有接触面斜上方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 acrossalongthrough1.There is a tree
6、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 Tang Dynasty _ last SundayExercises1.Japan lies _ the east of China.2.There is a bridge _ the river.oninatatin/toover3._ 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.ExercisesBelowUnderthroughacrossThanks.
