be动词的的概念与用法1.Be动词有三个,am,is还有are.我用am,你用are,is跟着他她它,复数全部都用are.如果遇到过去时,was来把am,is替,were来把换掉动词are2.do和be动词的用法区别Be动词就是(am,are,is)..句子中如果没有实意动词(例如:write,buy)之类的动词,就直接在主语后面加Be动词。而如果是句子中有实意动词,那么如果你要改为一般疑问句,就要借助DO(do也称为助动词),例如:Istudy.改为一般疑问句:Doyoustudy?顺口溜:be氏三朵花,am,is还有are,我(I)恋am,你(you)恋are,is跟了他(he)她(she)它(it),单娶is,复娶are。详细讲解:英语的be动词是个用法比较复杂的动词。复杂的原因有两点:1、除了原形的be之外,对于不同人称代词以及单数名词和复数名词,be会有各种变化形式和缩写形式。概括一下有七种形式:be,am,is,are,was,were,been,being。它们与人称代词和名词单、复数的搭配关系是:现在时Iam,youare,he/she/it/is,we/you/theyare;名词单数、不可数名词用is,复数用are。缩略式I'm,you're,he's,we're,you're,they're否定缩略式I'mnot,isn't,aren't过去时Iwas,youwere,he/she/it/was,we/you/theywere;名词单数、不可数名词用was,复数用were。否定缩略式wasn't,weren't过去分词been现在分词being2、在句子中,be有两种主要作用:一是作为系动词(TheLinkingVerb),本身可以作用谓语动词;二是做为助动词(TheAuxiliaryVerb),与谓语动词一起构成各种时态和被动语态等。下面做个简要的讲解。一、be动词做系动词1、系动词表语”的结构当be动词做系动词使用时,主要构成“系动词表语”的结构,在句子中做谓语。表语可以是名词、形容词、副词、介词短语等。例如:Themanisascienceteacher.Mary'snewdressesarecolourful.Motherisinthekitchennow.Ihavebeentherebefore.Theyshallbehereat10:00tommorow.Thatcan'tbetrue.Youarenotbeingverypolite.Yourbrotherisbeingveryannoyingthisevening2、be动词的一般疑问句,方法是把be移到主语前面,也可说成是移到句首。Isthemanascienceteacher?Yes,heis./No,heisn't.AreMary'snewdressescolourful?Yes,theyare./No,theyaren't.Wasmotherinthekitchenthen?Yes,shewas./No,shewasn't.Wereyouathomethedaybeforeyesterday?Yes,Iwas./No,Iwasn't.Wasshelatethismorning?Yes,shewas./No,shewasn't.3、be动词用在特殊疑问句在特殊疑问句里,be动词仍然移到主语前面,但特殊疑问句是以特殊疑问词开头的,所以be动词只能说是移到主语前面,或者说是在特殊疑问词的后面。例如:Whosebikeisbroken?XiaoMing'sbikeis.Whowassingingintheroom?Mr.Zhangwas.Whereareyoufrom?IamfromWuhu.Whatclasswereyouin?WewereinClass2.HowoldisTom?Heisten.4、be动词的否定句be动词做谓语时,它的否定形式是在be后加not,并且可以缩写。例如:Itisnotsunnytoday.Tomandhisfriendsarenotinthepark.YouwerenotnineyearsoldwhenIwenttotheuniversity.Hewasnotoftenlateforhisclasswhenhewasastudent.Iwasn'thereyesterday.Myparentsweren'tathomelastSunday.5、be动词的祈使句be动词的祈使句有肯定和否定两种形式。肯定形式是以be动词开头,而否定形式或强调句形,要加don't或do。例如:Becareful!Beagoodboy!Don'tbesilly!Don'tbeafool!Dobeobedient!Dobecareful.二、be动词做助动词助动词be有两个基本用法,一是与谓语动词一起构成各种时态,二是构成被动语态。1、“be现在分词组”成各种进行式时态。例如:Tony'smaidiswashinghisnewcar.Thechildrenareplayinginthefield.SamuelwaseatingwhenIcamein.Wehavebeenlivingheresince1959.Thistimenextdaytheywillbesittinginthecinema.三、注意事项英语句子中,为了表达时态或被动语态的需要,常常会出现几个助动词连在一块儿使用。也就是说,助动词be会和其它助动词一起使用。这时候,整个句子的一般疑问句和否定句,就不一定是对be进行变化了,而是以第一个助动词为主进行变化。即哪个助动词在先,就以它为主进行变化。例如:[肯定句]AllthewonderfulbirdscanbefoundinourBirdPark.(助动词有两个:canbe)[疑问句]CanallthewonderfulbirdsbefoundinourBirdPark?(移第一个can)[否定句]AllthewonderfulbirdscannotbefoundinourBirdPark.(在第一个can后加not)[肯定句]Ihavebeentherebefore.(两个助动词:have,been)[疑问句]Haveyoubeentherebefore?[否定句]Ihavenotbeentherebefore.[肯定句]Ishallbehavingmysupperatsixtomorrowevening.(两个助动词:shall,be)[疑问句]Willyoubehavingmysupperatsixtomorrowevening?[否定句]Ishallnotbehavingmysupperatsixtomorrowevening.四.助动词be,无词义,辅助主要动词一起在句中作谓语动词。用法如下:1.bedoing:构成进行时态,有现在和过去两种进行时态。如:Thegirlsisreadingandcopyingthenewwordsnow.YoungTomwasalwaysaskingquestionsandtryingoutnewideas.2.begoingtodo,表示"打算或将要做某事",be有现在和过去两种形式。如:Wearegoingtoplanttreesinthepark.Ididn’tknowifshewasgoingtocomehere.3.betodo,表示"按
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