四单元知识点1.频率副词:一般用来表示动作发生的次数、频率。常见频度副词按频率大小排列如下:always(100%)usually(80%)often(60%)sometimes(40%)共同点:放于主语后面,动词前面。例:Iusuallydohomework.Ioftenreadbooks.IsometimeswatchTV.sometimes位置灵活,句首、句中和句末都可以。例:SometimesIgotothecinema.Isometimesgotothecinema.Igotothecinemasometimes.2.第三人称单数:首先,要清楚第一、第二、第三人称各是什么。第一人称就是“我”和“我们”。第二人称是“你”和“你们”。第三人称单数是“他”、“她”和“它”,复数则是“他们”、“她们”和“它们”。※第三人称单数有:人称代词he,she,it,单个人名(Danny,LiMing,Tom,Mymum…)、单数可数名词(thecar)。※在一般现在时的句子中,当句子的主语为第三人称单数时,句子中的动词要相应地采用单数形式,即第三人称单数形式,也称“三单”或“单三”。※动词第三人称单数的变化规则:1.大部分的动词,构成第三人称单数时,直接加-s。如:read-reads,play-plays,listen-listens,take-takes,climb-climbs,clean-cleans,write-writes,cook-cooks。2.当动词词尾是-s,x,ch,sh时,构成第三人称单数时,加-es。如:watch-watches,wash-washes。3.动词词尾是-o的话,需要在词尾加-es构成第三人称单数。如:do-does,go-goes。4.特殊情况,have的第三人称单数为has。※句子练习:要点:1.句子的主语是第三人称而且还是单数。2.还经常和频率副词连用。1.Heoftenreadsbooks.2.Sheoftenwritesemails.3.GuoYangoftenplaysthepiano.4.Jennyoftentakespicturesattheweekend.5.Itgoesfast.6.Sometimesmydadcooksthemeal.7.LiMingoftencleansthewindowatSaturday.3.陈述句变一般疑问句变化规则:①句中有“is,are或can”的句子,把“is,are或can”提到句首。例如:陈述句:HeisfromAustralia.变成一般疑问句:IshefromAustralia?陈述句:Jennycanwashclothes.变成一般疑问句:CanJennywashclothes?陈述句:WearegoingtohelpGrandpaLi.变成一般疑问句:AreyougoingtohelpGrandpaLi?②句中没有“am,is,are或can”的句子,如果主语是第一人称、第二人称或第三人称复数的句子,句首加“Do”,“I,We”变成“you”,句号变问号,其余单词不变。例如:陈述句:Icancleanthefloor.变成一般疑问句:Canyoucleanthefloor?陈述句:Ioftenclimbthehillattheweekend.变成一般疑问句:Doyouoftenclimbthehillattheweekend?陈述句:IliveinBeijing.变成一般疑问句:DoyouliveinBeijing?③句中没有“am,is,are”的句子,如果主语是第三人称单数时,句首加“Does”,动词三单形式还原成动词原形,句号变问号,其它单词不变。(提醒:在句首加does,第三人称已经通过does体现出人称的变化了,所以动词要用动词原形,不能再用动词的三单形式了。)例如:陈述句:Peteroftenplaystheviolinattheweekend.变成一般疑问句:DoesPeteroftenplaytheviolinattheweekend?陈述句:Heoftendoeshousework.变成一般疑问句:Doesheoftendohousework?注意:变为疑问句的第一个单词的第一个字母必须大写。4.询问周末做什么的特殊疑问句:用特殊疑问词what引导。句式基本结构:What+助动词(do或does)+主语+频率副词+do+其他?①询问第二人称的周末活动:Whatdoyouoftendoattheweekend?Ioftentakepictures.②询问第三人称单数的周末活动:Whatdoesyourmotherdoattheweekend?Sheoftengoesshopping.WhatdoesPeterdoattheweekend?Heoftenlistenstomusic.Sometimesheplaysthepiano.WhatdoesDannyusuallydo?Heusuallyplaysfootball.※难点单词和句子:1.Haveaniceweekend!周末愉快!2.在周末:attheweekend3.sometimes的书写没有空格,不能写成sometimes4.Let’shaveapicniconSaturday.让我们周六去野餐。let’s完整形式letus5.需要注意的几个动词短语三单形式:goesfishing,goesshopping,goestothecinema,goestothemuseum,doeshomework,doeshousework,washesclothes,washesthedishes,watchesTV.6.句子:SometimesIgotothepark.和Isometimesgotothepark.意思一样,都是我有时去公园。※易错读音:1.write2.well3.very4.climb5.here※易错词组:1.play+the+乐器:playtheviolinplaythepianoplaythedrums2.play+球类:playfootballplaybasketballplayping-pong3.区分读音和意思:(watchTVwashclothes)(dohouseworkdohomework)4.区分介词的使用:attheweekendonSaturdayonSunday※四单元动词:go,do,help,have,visit,take,listen,read,play,watch,wash,write,※四单元主题作文:MyFamily’sWeekendsWehaveniceweekends.Myfatheroftendoeshouseworkattheweekend.Sometimeshegoesfishing.Mymotheroftenwashesclothes.Sometimesshegoesshopping.Ioftenreadbooks.SometimesIgotothelibrary.Ilikereadingverymuch.Ilikemyweekends.