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1、介词一、意思是“用”的几个词介词有三个：in,with,by，在句首或句末作状语。1.in+language(English,Chinese,French,Japanese等),What’sthisinEnglish?InEnglish,it’sanorange.2.with+具体的工具（pen,pencil,knife等）,单数名词前要加冠词。Iwanttowritewithapencil,andIdon’tlikewritewithapen.Chinesepeopleeatfoodwithchopsticks,butwesternpeopleliketoeatfoodwi
2、thknivesandforks.3.by+抽象的工具（e-mail,force,phone等）表方式或手段，名词前不用冠词;by+动名词或动名词短语(通过，靠，以)；by+交通工具（car,bus,bike）Sendthisletterbye-mail.Shelivesbysellingfruit.Mymothermakeslivingbyteaching.动词有一个：use;usesthtodosthChinesepeopleusechopstickstoeatfood.Weuseaknifetocut.二、in的用法1．in+月份、年份；on+日子/星期/某个不确定的具
3、体日子inMarch,in2014,inmarch2014onApril1,onMonday,onarainyday此外：inthemorning/afternoon/evening/night;inspring/summer/autumn/winteratnoon/night/midnightat8o’clock2.in+时间段（threedays,aweek等）在…之后，句子用将来时After+时间段（threedays,aweek等）在…之后，句子用过去时;after+时间点，句子用将来时Myfatherwillbebackinaweek.Myfathercamebac
4、kafteraweek.Iwillplaybasketballafterschool.Hewillbebackafterthreeo’clock.3.in+颜色+服装，意思是：穿着什么颜色的服装Thegirlisinaredskirt.Wehavegreensweatersinwhiteandred.4.in+地点，在…里面;intheeast/west/south/northof在…东、西、南、北，一地在某个地的范围内inthehouse;inthesky;intheeastKunmingisinthenorthofYunnan.三、with的用法1作“用”讲，见上文。2.
5、做“和…”讲，常用于句末。and是连词,连接两个名词。Iwenttothezoowithmyparentslastweek.MyparentsandIwenttothezoolastweek.3.作“有”讲，在名词后面作后置定语。I’dliketobuyahousewithagarden.Thegirlwithlonghairisverybeautiful.反义词：without“没有”I’dliketogowithoutyou.Thehousewithoutagardenischeaper.Sheleftwithoutsayinggoodbye.4.“随着区别：with是介
6、词，with+名词+名词/介词短语/现在分词（称为独立主格结构）as是连词+句子Withtimegoingby,Ilearnmoreandmoreknowledge.Withnolightoutside,itfeltlikemidnight.Withahardjobinacrayonfactory,hedoesn’tfindmuchtimetovisithishometown.Itwashardtohavefunwithaseriousstormhappeningoutside.Astimegoesby,Ilearnmoreandmoreknowledge.5.其它用法Ist
7、hatOkwithyou?那样你行吗？四、on的用法1.在…上面（正上方，物体有接触）Abookisonthedesk.2.关于（详细论述的）；about关于（范范谈及）Thescientistplannedtowriteabookonenvironmentalpollution.Theteacheraskedstudentstowriteanarticleaboutfriendship.Forhomework,ourteachertoldustowriteaboutourvacation.3.on+具
