*Unit6Preposition(介词)*表示时间11.表示时间（at,on,in,within,during,after,before,till,until,since,by...）HeworkedinafactoryduringWorldWarII.TheticketisvaliduntilMarch.Hehasbeenlivinginthiscitysince1950.1.1at+钟点Theboardmembersmetat10:00a.m.,thenhadalunchbreakatnoon.1.2on+星期，on+月，日IgotothegymonMondaysandFridays.ThePeople’?sRepublicofChinawasfoundedon1stOctober,1949.*表示时间11.3in+月份，in+年份，in+季节IamgoingtotakemyvacationinSeptember.Theancientcitywasfoundedin1065A.D.Weusedtogoswimmingintherivernearourtowninsummer.1.4区别inthemorning/onSundaymorningIusuallygetupat7:00inthemorning.JackarrivedonSundaymorning.in用于表示较长的时间，即期间，因此表示上午、下午、月、季度、年、世纪等都用in;On用于表示确切的某一天，因此，具体表示某天，某天的上午、下午、晚上或者某种场合等都用on.*表示位置22.表示位置(at,in,on,over,above,under,below,beneath,before,behind,up,down,beside,about,around,beyond,between,among,amid(st)...TheyliveinasmallvillageneartheGreatWall.Heputanecklacearoundherneck.2.1区别in,atShewasborninTaiyuanandnowlivesinBeijing.IhaventknownJackforverylong,butIknewhissisteratcollege.in用于较大的空间，含有“其中，当中，在······内”的意思：at用于表示某个较小的位置或地点，用于小城市、建筑物等，有时还可以表示“某地”、“在······附近”。*表示位置22.2区别on,above,overDuringthe1980?stheprovincesontheeastcoastdevelopedquickly.Thehelicopterhasbeenflyingabovethearea.Shewaswalkingintherain,withacolorfulumbrellaoverherhead.on表示与地面表面接触，或用于表示河流、道路、海岸、边界等；above表示“在······上面，高于······”；over表示“在······垂直上方”。2.3区别under,below,beneath*表示位置22.4区别between/among/amid(st)Dontstandunderatreeduringathunderstorm.Thetemperatureoftheroomisfivebelowzeronow.Thereisabasementbeneaththelivingroom.under表示“在······垂直下方”below表示“在······下面，低于……”beneath表示“在······下面”常指两物接触或者非常靠近。*表示位置2Inancienttimesmandidnotknowhowtoexplainthedifferencebetwee