单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,介词,1,介词1,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,2,介词是虚词，不能单独做句子成分，介词和它介词的定义2,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 21,st,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,3,表示时间的介词in表示较长的时间，如世纪，朝代，时代，年，3,on,表示,具体某一天及某一天的早中晚,on May 1,st,on Sunday morning,on a cold night in September,on Christmas Eve,表示时间的介词,4,on表示具体某一天及某一天的早中晚表示时间的介词4,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,5,表示时间的介词at表示某一时刻或较短暂的时间5,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,。,6,注意：6,“,自从,以来,”,since,for,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,7,“自从以来”since,for1.He has work,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,8,在之前 before1.Please wait her,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.,9,表示时间的介词till和until 直到为止(肯定句,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.,10,表示时间的介词by 最迟在之前10,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,表示地点的介词,11,in表示较大的地方，如大城市、国家、洲等at home,a,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,12,in表示在某一区域以内表示地点的介词12,1.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,13,1.B is in the north of A.BADCi,over,under,above,below,on,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,14,overunderabovebelowon表示方位的介词正上,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,15,along/down 沿着，顺着表示方位的介词 acros,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,16,1.There is a tree in front of,_ Friday evening _ the 1980s,_ the age of _ midnight,_ the Tang Dynasty _ last Sunday,Exercises,1.Japan lies _ the east of China.,2.There is a bridge _ the river.,on,in,at,at,in,/,to,over,17,_ Friday evening _,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,18,3._ the windows of her,Thanks.,19,Thanks.19,