债券合成、选择与套利

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英语四种时态解析一般现在时一般过去式现在进行时一般将来时概念经常、反复发生的动作或行为及现在的某种状况。用来叙述经常性发生的事情、习惯和爱好等。一般过去时表示过去某个时间发生的动作或存在的状态,用在叙述某人正在做某事的时候。(某动作正在进行)叙述将要发生的事情或打算。表示将要发生的动作或存在的状态及打算、计划或准备做某事。时间状语always,usually,often,sometimes,never,everyweek(day,year,month…),onceaweek,onSundays,ago,yesterday,thedaybeforeyesterday,in1989,justnow,attheageof5,oneday,longlongago,now,atthistime,thisweek,atthismoment,用look,listen提醒听者注意正在发生的事tomorrow,nextday(week,month,year…),soon,inafewminutes,by…,thedayaftertomorrow,基本结构1)动词原形(如主语为第三人称单数,动词上要加(e)S)2)am/is/are+形容词/名词。1)was/were+形容词/名字2)行为动词(动词过去式)am/is/are+doing1)am/is/are/goingto+do2)will+do否定式1)am/is/are+not。2)谓语动词若为行为动词,则在其前加don't,如主语为第三人称单数,则用doesn't,同时还原行为动词1)was/werenot2)didn’t+动词原形am/is/are+not+doing1)am/is/are/goingto+not+do2)will+not;在行为动词前加willnot,同时还原行为动词。一般疑问句1)把be动词放于句首2)用助动词do提问,三单则用does,同时,还原行为动词。1)was或were放于句首2)用助动词do的过去式did提问,同时还原行为动词。把be动词放于句首1)be放于句首;2)will提到句首1.不规则动词过去式Sweep--sweptteach–taughthave--hadgo--wentkeep--keptthink--thoughtdo--didfind--foundsleep--sleptbuy--boughteat--atesay--saidfeel--feltdrink--drankis/am—wastake--tookread--readgive--gaveare--weremean--meantput–putsingsangdrive—drovemeet--metcut--cutbegin--beganspeak--spokemake--madelet--letring--rangwrite--wrotesee--sawfly--flewrun--ranride–rodecome--camedraw--drewsit--sathear--heardtell--toldgrow–grewget--gotknow–knewlearn--learned/learnt特殊疑问句1)be放主语前2)主语前加do或does(动词还原)1)疑问词+did+主语+动词原形?2)疑问词当主语时:疑问词+动词过去式?疑问词+is/are+主语+doing?1)疑问词+be+主语+gongingto+动词原形?2)疑问词+will+主语+动词原形?动词变化1)一般情况,直接+s2)以s,x,sh,ch,o结尾,+es3)以”辅音字母”+y结尾,变y为I,加es4)特殊情况have-has1)直接加ed2)以不发音的e结尾的,+d3)以辅音字母+y结尾的,变y为i加ed4)以重读闭音节结尾的,双写最后的辅音字母+ed5)不规则动词过去式1)一般情况,直接加ing2)以不发音的e结尾,去e加ing3)重读闭音节双写最后字母再加ing,时态综合练习一、用所给动词的适当形式填空1.TomandMary___________(come)toChinalastmonth.2.Mike_________________(notgo)tobeduntil12o’clocklastnight.SoI_______(get)uplate.3.Mary__________(read)Englishyesterdaymorning.4.There_________(be)noonehereamomentago.5.I___________(call)Mikethismorning.6.Ilistenedbut___________(hear)nothing.7.Tom___________(begin)tolearnChineselastyear.8.Lastweekwe_________(pick)manyapplesonthefarm.9.Mymother________________(notdo)houseworkyesterday.10.ShewatchesTVeveryevening.Butshe_______________(notwatch)TVlastnight.11.________yourfather________(go)toworkeverydaylastyear?12.—Whattime_______you_______(get)toBeijingyesterday?—We__________(get)toBeijingat9:00intheevening.13.What__________(make)himcryjustnow?14.Lastyeartheteacher___________(tell)usthattheearthmovesaroundthesun.15.There____________atelephonecallforyoujustnow.(be)16.There__________notenoughpeopletopickapplesthatday.(be)17.There_____________anyhospitalsinmyhometownin1940.(benot)18.There____________enoughmilkathomelastweek,wasn’tthere?19.Eli____________toJapanlastweek.(move)20.–When_______you_________(come)toChina?-Lastyear.21.Didshe________(have)supperathome?22.Jack____________(notclean)theroomjustnow.23._________(be)itcoldinyourcityyesterday?24.Howmanypeople________(be)thereinyourclasslastterm?25.It________(be)hotyesterdayandmostchildren_______(be)outside26.There________(be)afootballmatchonTVyesterdayevening,butI_________(have)notimetowatchit.27.Heatesomebreadand_________(drink)somemilk.28.________he__________(finish)hishomeworklastnight?29.I__________(be)tiredyesterday.30.I___________(gain)Artsdegreelastyear.31.What_________you___________(do)lastnight?32.Mygrandfather_________(leave)HongKongforNewYorkin1998.33.What_______he________(do)yesterday?34.LastweekI_______(buy)anewbike.35.He________(be)herejustnow.36.He__________(notfind)hiskeylastnight.37.Myfather__________(drink)alotofwineyesterday.38.________you________(finish)yourhomeworkyesterday?39.I________(eat)someeggsandbreadthismorning.40.Hermother__________(notgive)thegirlanypresent.41.Thebuses______(use)alotofoil.42.Mydaughter_________(watch)TVeveryday.Sometimesshe_______(see)afilmonSunday.43.LiWei________(have)adaughter.44.Hermother___________(teach)Englishatamiddleschool.45.Jackoften___________(listen)totheradio.46.He________(say)thatLiLeiistired.47.TomandMary___________(come)toChinalastmonth.48.Mike_________________(notgo)tobeduntil12o’clocklastnight.SoI_______(get)uplate.49.Mary__________(read)Englishyesterdaymorning.50.There_________(be)noonehereamomentago.51.I___________(call)Mikethismorning.52.Ilistenedbut___________(hear)nothing.53.Tom___________(begin)tolearnChineselastyear.54.Lastweekwe_________(pick)manyapplesonthefarm.55.Mymother________________(notdo)houseworkyesterday.56.ShewatchesTVeveryevening.Butshe_______________(notwatch)TVlastnight.57.________yourfather________(go)toworkeverydaylastyear?58.—Whattime_______you_______(get)toBeijingyesterday?—We__________(get)toBeijingat9:00intheevening.59.What__________(make)himcryjustnow?60.Lastyeartheteacher___________(tell)usthattheearthmovesaroundthesun.

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