unit7动词与时态一

动词与时态（一）NameScore IbelieveIcandoitbest!我相信我可以做到最好!一般现在时一般现在时表示现在的一段时间内经常发生的动作、存在的状态。例：HeoftenhelpsmewithmyEnglish.Ilikeswimmingverymuch.Sheisintheteachers’officenow.HisbrotherreadsEnglisheverymorning.(一)一般现在时的构成谓语动词的人称变化：当主语是第一人称、第二人称或第三人称复数形式时，谓语动词要用动词原形。当主语是第三人称单数形式时，谓语动词用第三单数形式，即动词词尾要加-s或-es。例：Wehavefourclassesinthemorningeveryday.Theymakeprogresseveryday.Shelikessingingverymuch.动词的第三人称单数形式变化可分为规则变化和不规则变化两种情况。1．规则变化①一般直接在动词词尾加-s。例：ask→asks/work→works/get→gets/stay→stays②以字母s,x,ch,sh或o结尾的动词，在词尾直接加-es。例：watch→watches/wish→wishes/fix→fixes/do→does/go→goes/pass→passes③以辅音字母加-y结尾的动词，要先变y变i再加-es。例：try→tries/study→studies/cry→cries/fly→flies2．不规则变化例：be→is have→has（二）一般现在时的句式转换1．当句子中有be动词（am,is,are）或情态助动词时，则把be动词或情态动词提到主语的前面变成疑问句，在be动词或情态动词后加not变成否定句。例：Sheisastudent→Issheastudent?→Sheisn’tastudent.Icanswim.→Canyouswim?→Ican’tswim.2．当句子中既没有be动词，也没有情态动词时，则在主语前加助动词do/does变成问句，在主语后谓语动词前加助动词do/doesnot变成否定句，助动词后的谓语动词要变成动词原形。例：Wegetupat7:00everymorning.→Doyougetupat7:00everymorning?→Wedon’tgetupat7:00everymorning?Shehasalittlebrother.→Doesshehavealittlebrother?→Shedoesn’thavealittlebrother.（三）一般现在时的用法1．表示经常性、习惯性或永久性的动作或存在的状态，通常与副词sometimes,often,usually,always,everyday(year,month),once,twice,threetimesaday(week,month,year)等表示频度的时间状语连用。例：Theyusuallygotoschoolbybike.Itakethemedicinethreetimesaday.Igettoschoolat7:05everymorning.Shetelephonesherparentsonceaweek.Mary’sfatherisapoliceman.Thereare50studentsinmyclass.Sheisourmathsteacher.MygrannylikesBeijingOperaverymuch.Shecanswimverywell.2．表示客观真理、科学原理、自然现象、现阶段存在的客观事实或格言、谚语等。例：Thesunrisesintheeastandsetsinthewesteveryday.Theearthmovesaroundthesun.ThemanwhohasneverbeentotheGreatWallisnotarealman.TomorrowisTuesday.3．用于由if,unless,aswhen,assoonas,until,till,after,before,while/whenever,whatever,evenif,eachtime,themoment,everytime,nomaterhow(what,when…),solongas,onconditionthat等词引导的时间、条件、地点、让步、方式以及比较等状语从句中表示将来要发生的动作或状态，其从句多是一般现在时态，即“主将从现”。例：Wewillgotothezooifitisfinetomorrow.Shewilltellmethenewsassoonassheseesherfriends.Theywillgotoworkatthisschoolwhentheyleavecollege.I’llcometoseeyouwhetherhecomesornot.Wewon’tseeeachotheruntilthewintervocationcomes.4．表示安排或计划好的将来的动作，这里的动词只能是表示移动的动词，如go/come/leave/start/arrive/begin等。例：Thefirstclassbeginsat7:30thisevening.Thebusstartsat5:30inthemorningTheyleavehereforTianjinnextMonday.5．表示状态或感觉的动词，如see,understand,feel,think,want,hear,find,have,be,love,like,hope,wish等，若它们表示现在发生的行为时，多用一般现在时而不用进行时态。例：Iamateachernow.NowIunderstandwhyyoudidn’tcomehereyesterday.Doyouwanttobuythecatnow?Whatdoyouthinkofournewteacher?Ilovemyfriendsverymuch.Iwishyouagoodluck.Ihopeyou’llbebacksoon.一般过去时一般过去时表示过去发生的动作或存在的状态，这种动作或状态可以是经常性的、习惯性的、也可以是一次性的或偶然性的。例：Heoftengotuplatelastyear,Shewasateacherwhenshewasyoung,Wemetatthestreetyesterday.Didyouwritetoyourparentslastmonth?（一）一般过去时的构成在一般过去时态的句了中，谓语动词、连系动词或助动词要用过去式形式。动词过去式的变化有规则变化和不规则变化两种。1．规则变化①一般在动词词尾直接加-ed。例：ask→asked/work→worked/stay→stayedplay→played/answer→answered/want→wanted②在以e结尾的动词后直接加-d.例：like→liked/live→lived/love→loveduse→used/change→changed/joke→joked③以辅音字母加y结尾的动词要变y以i再加-ed.例：study→studied/cry→cried/try→triedcarry→carried/dry→dried但是以元音字母加y结尾动词直接加-ed.④以一个元音字母加一个辅音字母结尾的重读闭音节动词，要先双写最后一个辅音字母再加-ed.例：stop→stopped/shop→shopped/drop→droppedplan→planned/travel→travelled（特殊的r音节：prefer→preferred）2．不规则变化许多动词的过去式及过去分词变化是不规则变化，而且大部分是常用动词。不规则动词的过去式构成也有一点规律，如ow变成ew和own,i变成a和u,eep变成ept,ell变成old等等，这要靠仔细观察、反复诵读和认真记忆。例：am/is→was→beenare→were→beengive→gave→givencome→came→come（二）一般过去时的句式转换。1．当句子中有be动词（was,were）或情态助词的过去式时，则把be动词或情态动词提到主语的前面变成疑问句，在be动词或情态动词后加not变成否定句。例：Shewashereyesterday.→Wasshehereyesterday?→Shewasn’thereyesterday.Hecoulddoit.→Couldhedoit?→Hecouldn’tdoit.2．当句子中既没有be动词，也没有情态动词时，则在主语前加助动词did变成问句，在主语后谓语动词前加助动词didnot变成否定句，助动词后的谓语动词要变成动词原形。例：Wegotupat7:00yesterdaymorning.→Didyougetupat7:00yesterdaymorning?→Wedidn’tgetupat7:00yesterdaymorning.Shehadasmallboxlastyear.→Didshehaveasmallboxlastyear?→Shedidn’thaveasmallboxlastyear.（三）一般过去时的用法1．表示在过去某时间发生的动作或存在的状态，常与yesterday,ago,lastyear(week,month,…),in1985,justnow,onFebruary28,before,thelastday(month,week,year…)等表示过去时间的状语或时间状语从句连用。例：Wemeteachotherinthestreetyesterday.BobwasbornonMay2,1987.TheyworkedhardalldayathomelastSunday.Justnowhecalledyouandleftamessage.Ididn’thavebreakfastthismorning.Wewalkedtogetherhandinhand.WhenIwasinthecollegeIdidmorningexerciseseveryday.Tomalwaysgotupveryearlyandreadbookordidhomework.TheyheldasportmeetinglastSaturday.2．表示过去经