be动词,情态动词,助动词do.doc

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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：变一般疑问句时把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:Whatishe?orWhatdoeshedo?2.由情态动词can,may,should等

2、构成的句子:变一般疑问句时把can,may,提到句子的前面,句尾用问号即可.变否定句时直接在can,may,后面加not即可.例如:肯定句:Shecanswim.一般疑问句:Cansheswim?否定句:Shecannotswim.画线提问:对she提问:Whocanswim?对swim提问:Whatcanshedo?3.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.变否定句时把don’t/doesn’t放在动词的前面。要注意观察动词的形式并对号入座。一般

3、疑问句和否定句的动词三单式都要变回原型。play-----doplays-----does 例如:肯定句:Theyplayfootballafterschool.Heplaysfootballafterschool.一般疑问句:Dotheyplayfootballafterschool?Doesheplayfootballafterschool?否定句:Theydon't(donot)playfootballafterschool.Hedoesn’t’playfootballafterschool.画

4、线提问:对they/he提问:Whoplaysfootballafterschool?对playfootball提问:Whatdotheydoafterschool?Whatdoeshedoafterschool?对afterschool提问:Whendotheyplayfootball?Whendoesheplayfootball? 针对性练习按要求改写句子：1.Iknowtheanswer.(一般疑问句)          ______________________theanswer?2.Wec

5、anseesomebirds.(一般疑问句)　____________see______birds?3.Hedesignsclothes.(一般疑问句)  ______he________clothes?4.Therearesomeflowersontheteachers’desk.(一般疑问句)__________________flowersontheteachers’desk?5.Therearesomeapplesonthetree.(否定句)There__________________ap

6、plesonthetree.6.Ithinkheisveryold.(否定句)I______thinkhe______veryold.7.Pleasecolouritgreen.(否定句)____________colouritgreen.8.Thesedoctorsarehelpful.(变否定句)_____________________________.9.Youmayhavesomehotdogs.(一般疑问句)_________________________________?.10.The

7、rearen’tanypearsinthebox.(同义句)Thereare______pearsinthebox.11.Thissignmeans“Nosmoking”.　What______thissign_________?12.Shelooksyoung.（改一般疑问句）________she_______young?13.Sheisyoung.（改为一般疑问句）________________________?14.Mypencilsareinthepencil-box.(对划线部分提问)_

8、___________yourpencils?15.Igetupatsixeveryday.(对划线部分提问)______________________yougetupeveryday?16.Theyliketowalkhome.(改为一般疑问句)______they_______________________________?17.Thesearecars.(用buses改写成选择疑问句)　Arethesecars____________?18.M