时间名词前所用介词的速记歌年月周前要用in,日子前面却不行。遇到几号要用on,上午下午又是in。要说某日上下午,用on换in才能行。午夜黄昏须用at,黎明用它也不错。at也用在明分前,说“差”可要用上to,说“过”只可使用past,多说多练牢牢记,莫让岁月空蹉跎。下面就时间概念的介词用法做一简要介绍和比较。1.at表示时间概念的某一个点。(在某时刻、时间、阶段等)。at1:00(dawn,midnight,noon)在一点钟(黎明、午夜、中午)theseareourchieftasksatthepresentstage.这些就是我们现阶段的主要任务。2.on1)表示具体日期。theyarrivedinshanghaionmay25.他们在五月二十五日到达上海。注:(1)关于在周末的几种表示法:at(on)theweekend在周末---特指at(on)weekends在周末---泛指overtheweekend在整个周末duringtheweekend在周末期间(2)在圣诞节,应说atchristmas而不说onchristmas2)在(刚……)的时候。onreachingthecityhecalleduphisparents.一到城里他就给父母打了一个电话。3.in1)表示时段、时期,在多数情况下可以和dur-ing互换,前者强调对比,后者强调持续。in(during)1988(december,the20thcentury)在一九八八年(十二月、二十世纪)ireturnedtobeijinginthemiddleofjune.我是六月中回北京的。但如果表示在某项活动的期间,则只能用during。duringmymilitaryservice(thetrip)在我服役期间(在旅行期间)2)表示以说话时间为基点的(若干时间)以后,常用作将来时态谓语的时间状语。如这时要表示(若干时间)内,常用within。比较:themeetingwillendin30minutes.(三十分钟后)会议三十分钟后结束。canyoufinishitwithin30minutes?(三十分钟内)你能在三十分钟之内完成这件事吗?但在过去时态中,in可用于表在若干时间以内,这时不要误用during。thejobwasdoneduringaweek.(wrong)thejobwasdoneinaweek.(right)这工作在一星期内就完成了。4.after表示在(某具体时间)以后,注意不要和in的2)意混淆。aftersupper(8o’clock,thewar)晚饭(八点、战)后比较:hewillbebackintwohours.他将在两个小时以后回来。hereturnedtohishometownafterthewar.战后他回到了故乡。5.for表示(动作延续)若干时间,有时可省略。istayedinlondon(for)twodaysonmywaytonewyork.在去纽约的途中,我在伦敦呆了两天。6.since表示自(某具体时间)以来,常用作完成时态谓语的时间状语。sinceliberation(1980)自从解放(1980年)以来theyhavebeenclosefriendssincechildhood.他们从小就是好朋友。注:(1)sincethewar是指自从战争结束以来,若指自从战争开始以来,须说sincethebeginningofthewar。(2)不要将since与after混淆。比较:hehasworkedheresince1965.(指一段时间,强调时间段)自从1965年以来,他一直在这儿工作。hebegantoworkhereafter1965.(指一点时间,强调时间点)从1965年以后,他开始在这儿工作。7.by表示到……的时候,其谓语时态的用法:动作动词常用完成时态;状态动词(be)常用一般时态。比较:bynoon,everybodyhad(willhave)arrivedthere.bynoon,everybodywere(willbe)there.到中午的时候,大家都(将)到那儿了。以上探讨了介词表示时间概念时的用法和比较,上述介词除表示时间概念外还有其他的用法,英语学习者必须掌握其各种用法,才能灵活运用,提高自己的语言能力。小学英语语法复习要点(一)一、名词复数规则1.一般情况下,直接加-s,如:book-books,bag-bags,cat-cats,bed-beds2.以s.x.sh.ch结尾,加-es,如:bus-buses,box-boxes,brush-brushes,watch-watches3.以“辅音字母+y”结尾,变y为i,再加-es,如:family-families,strawberry-strawberries4.以“f或fe”结尾,变f或fe为v,再加-es,如:knife-knives5.不规则名词复数:man-men,woman-women,policeman-policemen,policewoman-policewomen,mouse-micechild-childrenfoot-feet,.tooth-teethfish-fish,people-people,Chinese-Chinese,Japanese-Japanese写出下列各词的复数I_________him_________this___________her______watch_______child_______photo________diary______day________foot________book_______dress________tooth_______sheep______box_______strawberry_____thief_______yo-yo______peach______sandwich______man______woman_______paper_______juice___________water________milk________rice__________tea__________二、一般现在时一般现在时基本用法介绍【No.1】一般现在时的功能1.表示事物或人物的特征、状态。如:Theskyisblue.天空是蓝色的。2.表示经常性或习惯性的动作。如:Igetupatsixeveryday.我每天六点起床。3.表示客观现实。如:Theearthgoesaroundthesun.地球绕着太阳转。一般现在时的构成1.be动词:主语+be(am,is,are)+其它。如:Iamaboy.我是一个男孩。2.行为动词:主语+行为动词(+其它)。如:WestudyEnglish.我们学习英语。当主语为第三人称单数(he,she,it)时,要在动词后加-s或-es。如:MarylikesChinese.玛丽喜欢汉语。一般现在时的变化1.be动词的变化。否定句:主语+be+not+其它。如:Heisnotaworker.他不是工人。一般疑问句:Be+主语+其它。如:-Areyouastudent?-Yes.Iam./No,I'mnot.特殊疑问句:疑问词+一般疑问句。如:Whereismybike?2.行为动词的变化。否定句:主语+don't(doesn't)+动词原形(+其它)。如:Idon'tlikebread.当主语为第三人称单数时,要用doesn't构成否定句。如:Hedoesn'toftenplay.一般疑问句:Do(Does)+主语+动词原形+其它。如:-Doyouoftenplayfootball?-Yes,Ido./No,Idon't.当主语为第三人称单数时,要用does构成一般疑问句。如:-Doesshegotoworkbybike?-Yes,shedoes./No,shedoesn't.特殊疑问句:疑问词+一般疑问句。如:Howdoesyourfathergotowork?动词+s的变化规则1.一般情况下,直接加-s,如:cook-cooks,milk-milks2.以s.x.sh.ch.o结尾,加-es,如:guess-guesses,wash-washes,watch-watches,go-goes3.以“辅音字母+y”结尾,变y为i,再加-es,如:study-studies一般现在时用法专练:一、写出下列动词的第三人称单数drink________go_______stay________make________look_________have_______pass_______carry____come________watch______plant_______fly________study_______brush________do_________teach_______二、用括号内动词的适当形式填空。1.Heoften________(have)dinnerathome.2.DanielandTommy_______(be)inClassOne.3.We_______(notwatch)TVonMonday.4.Nick_______(notgo)tothezooonSunday.5.______they________(like)theWorldCup?6.What_______theyoften_______(do)onSaturdays?7._______yourparents_______(read)newspaperseveryday?8.Thegirl_______(teach)usEnglishonSundays.9.SheandI________(take)awalktogethereveryevening.10.There________(be)somewaterinthebottle.11.Mike_______(like)cooking.12.They_______(have)thesamehobby.13.Myaunt_______(look)afterherbabycarefully.14.Youalways_______(do)yourhomeworkwell.15.I_______(be)ill.I’mstayinginbed.16.She_______(go)toschoolfromMondaytoFriday.17.LiuTao_______(do)notlikePE.18.Thechildoften_______(watch)TVintheevening.19.SuHaiandSuYang_______(have)eightlessonsthisterm.20.-Whatday_______(be)ittoday?-It’sSaturday.三、按照要求改写句子1.DanielwatchesTVeveryevening.(改为否定句)___________________________________________________2.Idomyhomeworkeveryday.(改为一般疑问句,作否定回答)____________________________________________________________________________________3.Shelikesmilk.(改为一般疑问句,作肯定回答)___________________________________________________________________________________4.Amylikesplayingcomputergames.(改为一般疑问句,作否定回答)____________________________________________________________________________________________5.