3、系动词Be(am--is--are)的用法

1系动词Be(am,is,are)的用法一、am,isare都属于be动词，be是他们的原型be动词的一般现在时有三种形式，即：am,is,are。1、基本形式：am、are、is(1)、am第一人称I+am(注意：“I”无论何时都要大写，不管位于句首还是句中)例：Iamabeautifulgirl.Iamtwenty.Iam还可缩写成I'm。如：I'mDavid.我是大卫。但是am与not不能缩写。(2)、are第二人称you+are;一人称复数we+are；三人称复数they+are其他复数名词+are(注意：第二人称单复数同形，都为you)例：Youaremygoodfriend.Weareinthesameclass.Theyareontheroad.Thebooksareonthedesk.are与主语还可缩写。如：Weare=We're，Theyare=They're,Youare=You're。而are与not可缩写成aren't。(3)、is第三人称he(男)+is;she(女)+is;it(不是人)+is;其他单数名词+is例：He\Sheisagoodstudent.Itisawhitecat.Adogisonthatstreet.is也可与主语缩写,如:Heis=He's,Mymotheris=Mymother's等。但是Thisis不可缩写。而is与not可缩写成isn't。如:Thisisn'tabook.这不是一本书。二、请记住以下口诀：我用am，你用are，is连着他，她，它；单数名词用is，复数名词全用are。变疑问，往前提，句末问号莫丢弃。变否定，更容易，be后not莫忘记。疑问否定任你变，句首Am,Is,Are大写莫迟疑，,句末问号莫忘加三、注：复数主语全用are。指示代词作主语,This、that用is，These、those要用are。回答一般疑问句,Yes,或No简回will/can/could/would/should/shall等助动词后面加be其他时候,第一人称I后面用am第二人称,复数,用are单数用is...2四、由连系动词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?另：特殊疑问句中：where\how\who\what\why+be动词+人称代词或名词？例：Whatisyourname?MynameisGaoBuHan.Whereareyou?I’mintheclassroom.五、Be动词在一般过去时中的变化：be动词的一般现在时有两种种形式，即：was，were。1．am和is在一般过去时中变为was。（wasnot=wasn’t）2．are在一般过去时中变为were。（werenot=weren’t）3．带有was或were的句子，其否定、疑问的变化和am,is,are一样，即否定句在was或were后加not，一般疑问句把was或were调到句首一、练习:用恰当的be动词填空。1)I_____astudent.2)You____ateacher.3)____shefromJinan?No,she____.4)_____youfriends?No,we____.5)He_____inClass4,Grade1.6)It_____acar.7)They____cars.8)____yourmotherinChina?9)_____yourfriendsinNewYork?10)What____hername?11)These_____buses.12)Those_____oranges.13)Where_____hermother?14)Howold_____yourteacher?15)Whatclass_____youin?16)This____mybrother.17)That____apencil.18)MikeandI____students.19)____thereanappleonthetable?Yes,there____.20)There____manybooksinthestudy.21)There____someicecreaminthefridge.22)There____apearandsomecakesonthetable.23)Thechildren___playinginthebedroom.24)Therabbits___eatinggrass.25)What___yourfavoritesubject?26)Thegirl___drawing.27)I___aletter（字母.）28.Thesocks______onthedesk.3二、用is,are填空1.There______aspoonontheplate.2.There______somemilkonthetable.There______coffee,too.3.There______somecloudsinthesky.There______someboatsontheriver.4.There______someknivesinthebox.5.There______anewspaperinthelivingroom.6.______thereanybooksintheroom?Yes,there______.______thereanymagazinesonthetelevision?No,there______.7.There______apolicemaninthekitchen.8.There______60minutesinanhour.9.There______apencil,arulerand2booksonthedesk.10.There______2glassesandacuponthetable.三、将下列句子改为否定句和一般疑问句，并做肯定或否定回答。1.Itwasexciting.否定句：________________________________________________一般疑问句：____________________________________________肯、否定回答：__________________________________________2.Allthestudentswereveryexcited.否定句：________________________________________________一般疑问句：____________________________________________肯、否定回答：__________________________________________3.Theyareinhispocket.否定句：________________________________________________一般疑问句：____________________________________________肯、否定回答：__________________________________________4.Therewasacarinfrontofthehousejustnow.否定句：________________________________________________一般疑问句：____________________________________________肯、否定回答：__________________________________________5、Therearesomepeachesonthetree.否定句：________________________________________________一般疑问句：____________________________________________肯、否定回答：__________________________________________6.Theboyisdrawingintheartroom.否定句：________________________________________________4一般疑问句：____________________________________________肯、否定回答：__________________________________________