be动词,情态动词,助动词do

1、be动词，情态动词，助动词do/does的用法区别及练习1 .由连系am,is,are构成的句子：变一般疑问何时把am,is,are提到句子的前面，句尾用问号即可。变否定句时直接在am，is，are后面加not即可。例如：肯定句:Heisastudent.一般疑问句:Isheastudent否定句:Heisnotastudent.画线提问:对he提问:Whoisastudent对astudent提问:WhatisheorWhatdoeshedo2 .由情态动词can,may,should等构成的句子：变一般疑问何时把can,may提到句子的前面句尾用问号即可.变否定何时直接在can,may,后

2、面加not即可.例如:肯定句:Shecanswim.一般疑问句:Cansheswim否定句:Shecannotswim.画线提问：又tshe提问:Whocanswim对swim提问:Whatcanshedo3 .由行为动词构成的句子:需要加助词do或does.变一般疑问句时把do/does放在句子前面.变否定何时把don't/doesn放在动词的前面。要注意观察动词的形式并对号入座。一般疑问句和否定句的动词三单式都要变回原型。playdoplaysdoes例如:肯定句:Theyplayfootballafterschool.Heplaysfootballafterschool.一般疑问

3、句:DotheyplayfootballafterschoolDoesheplayfootballafterschool否定句:Theydon't（donot）playfootballafterschool.Hedoesnptlayfootballafterschool.画线提问:对they/he提问:Whoplaysfootballafterschool对playfootball提问:WhatdotheydoafterschoolWhatdoeshedoafterschool对afterschool提问:WhendotheyplayfootballWhendoesheplayfoot

4、ball针对性练习按要求改写句子：knowtheanswer.（般疑问句）theanswercanseesomebirds."般疑问句）seebirdsdesignsclothes.L股疑问旬）heclothesaresomeflowersontheteachers一般疑问句desk.（）flowersontheteachersdeskaresomeapplesonthetree份定旬）Thereapplesonthetree.thinkheisveryold.（否定句）Ithinkheveryold.colouritgreen.（否定句）colouritgreen.doctorsa

5、rehelpful.（变否定句）mayhavesomehotdogs.般疑问句）aren'tanypearsinthebe®仪句）Therearepearsinthebox.signmeans“Nosmoking”Whatthissignlooksyoung.（改一般疑问句）sheyoungisyoung.（改为一般疑问句）pencilsareinthepencil-box.对戈U线音B分提问）yourpencilsgetupatsixeveryday.«寸戈U线部分提问）yougetupeverydayliketowalkhome.（改为一般疑问句）theyare

6、cars.州buses改写成选择疑问句）Arethesecarsplantisonemonth01d.（就划线部分提问）plantboysareinourhouse.帔为therebe句型）twoboysinourhouse.planthastwogreenleaves.plantLigoestoHongKongbyplane.（同义句）MissLiHongKong.22.Thewomenworkintheshoefactory.（就戈U线部分提问）womenishappy,becauseheisgoingtotakeatriptomorrow.（就划线部分提问）fathercancookth

7、emeals.（就划线部分提问）father25.Youshouldaddwateroften.（一般疑问句）wateroften、变否定句时相关词的改变肯定句变否定句时，除将谓语变为否定式外，句中其他词语也可能随之改变，如将some改为any，too和also改为either，already改为yet，and改为or等：Therearesomebirdsinthetree.树上有些鸟。fTherearen'tanybirdsinthee.树上没有鸟。Helikesthegirl,too.他也喜欢这个女孩。fHedoesn'tlikethegirl,either他也不喜欢这个女

8、孩。Wehavealreadyseenthefilm.我们已看过这部电影。fWehavenotseenthefilmyet.我们没有看这部电影。Helikessinginganddancing.他喜欢唱歌和跳舞。fHedoesn'tlikesingingrdancing.他不喜欢唱歌也不喜欢跳舞。二、部分否定与完全否定比较以下句子：Allofuslaughedwhenweheardit.听到这事时我们都笑了。（肯定句）Allofusdidn'tlaughedwhenweheaM到.这事时我们并未都笑。（部分否定）Notallofuslaughedwhenweheardit.听到这事时我们并未都笑。（部分否定）Noneofuslaughedwhenweheard