No.6常用介词介绍—表示时间的介词Nov.9,2013(一)表示时间的介词:1.at,on,in(1)at表示“在…时刻、在..点钟”atseven(o’clock)---整点才能用o’clockateleven(o’clock)---整点才能用o’clockat5:30atlunch___________________正午时atnight______________日出时_______________Eg:我每天6:00起床。_________________________表示“在……岁”时用attheageof…。如:在五岁时_________________________夜间atnoon午饭时atsunriseIgetupat6:00everyday.Attheageoffive(2)on表示“在具体某一天或某天的上、下午”。如:①在星期一_____________②在四月一日_______________③三月十八日早晨我听到一声枪响。_________________________________________④泛指上、下午、晚上、夜间时用⑤但若指具体某一天的上述时段时,则一律用on。如:在十一月九日的晚上。———————————————————————OntheeveningofNovember9.onMondayIheardashotonthemorningofMarch18.inthemorning/afternoon/evening,atnight;onApril1st(3)in表示“在某月、季节、年、世纪”以及泛指的上、下午、晚上。在九月在11月在冬季在1999年在2013年在20世纪在上午/下午/晚上inSeptemberinNovermberinwinterin1999inthe20thcenturyinthemorning/afternoon/eveningin20132.for,during,through(1)for表示“一段时间”,后接与数词连用的时间名词。多与现在完成时连用。我入伍已5年了。_______________________________她已经病了几天了。_____________________________我们已经等了他们一个小时了。__________________________他已经在广州工作了10年了。___________________________I’vebeenasoldierfor5years./Ihavebeeninthearmyforfiveyears.Shehasbeenillforseveraldays.Wehavewaitedforthemforanhour.HehasworkedinGuangzhoufor10years.(2)during表示“在……期间”表示“持续一段时间”时,for后面必须跟“数字+时间名词”,而during后决不可接数字。在他逗留期间他参观了许多美丽的地方。_________________________________________________你在暑假做了什么?__________________________________________Hevisitedmanyniceplacesduringhisstayhere.Whatdidyoudoduringthesummervacation?(3)through表示“一直……,自始至终”整个冬天他们都在努力工作。_____________________________________________这些年来她始终把我当哥哥对待。_____________________________________________在会议上他们一直在讨论环境保护问题。_____________________________________________Theyworkedhardthroughthewinter.Shetreatedmelikeherbrotherthroughtheseyears.Theydiscussedenvironmentalprotectionthroughthemeeting.3.from,since(1)from表示“等时间的起点”,作“从……”解,多用于“from…to/till…”中。周一至周五你都可以过来这边。________________________________________________周一至周六你都可以去那儿。________________________________________________考试将从上午九点开始。_________________________________________________YoucancomeherefromMondaytoFriday.YoucangotherefromMondaytoSaturday.Theexamwillstartfrom9:00am.Payattention,please:①from“从……(开始)”,未必持续到现在,如:Eg:from1995to1998.从1995年到1998年。②而since是指“自从……以来一直持续到现在”,since一般只与现在完成时连用Eg:他自从1973年就离开了家乡。______________________________________________我们十年前就认识了。______________________________________________Wehaveknowneachothersincetenyearsago.Hehasbeenawayfromhomesince1973.③for与since表示一段时间,但for与时间段连用,而since与时间点连用。都用于完成时Eg:fortwohours(持续)两小时;sincelastweek自从上周以来我们认识已经有十年了。________________________________________________我们十年前就认识了。_________________________________________________Wehaveknowneachothersincetenyearsago.(时间点)Wehaveknowneachotherfortenyears.(时间段)4.before,by,till,until(1)before指“在……之前”请10点以前来。__________________________________会议将在下午三点前结束。________________________________________________我将在11点前赶到这儿。________________________________________________Iwillbeherebeforeeleveno’clock.Themeetingwillbeendedbefore3:00pm.Pleasecomebeforeteno’clock.(2)by指“不迟于,到……时为止”,一般与完成时连用。午饭前我必须做完作业。______________________________________________到本学期为止,我们将学会1000个单词。___________________________________________________到上学期末为止,我们已经学了1000多个单词了。____________________________________________________Wehadlearnedmorethan1000wordsbytheendoflastterm.Wewillhavelearnedmorethan1000wordsbytheendofthisterm.Imustfinishmyhomeworkbylunch.(3)till(until)“直到……为止”你必须一直等到他明天。______________________________________________直到他回来我们才会离开。_______________________________________________他昨晚直到12点才回来。______________________________________在肯定句中,till(until)必须与延续动词连用。若与点动词连用,till(until)只能用于否定句中。Youmustwaitforhimtilltomorrow.Hedidn’tcomebackuntiltwelveo’clocklastnight.Wewon’tleaveuntilhearrives.5.after,in,within①after表示“在……之后”,是before的反义词。晚餐后我们将举办晚会。_______________________________________________他患了癌症,一年后去世了。_______________________________________________We’llholdapartyafterdinner.Hegotacanceranddiedafterayear.②within“在……时间之内”我不需一小时就可把它做完。___________________________________我们必须在40分钟内吃完午餐。___________________________________Wemustfinishourlunchwithin40minutes.Icanfinishitwithinanhour.比较after与in①after后可跟时间段,只能用于过去时,Eg:afterthreeyearsEg:MysistercamebackfromAmericaafterthreeyears.after后也可跟时间点,可用于过去时和将来时。如after5o’clock(5点后)Eg:Hewillcomehereafter5o’clock.而in后必须跟时间段,如inanhour(一小时后)。in只能用于将来时,表示“在多久之后”Eg:I’llarriveinanhour.我一小时后到达。That’sallfortoday.Thankyou!