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1、be动词、情态动词和实义动词byXianjvMiddleSchoolWANGQianqian到目前为止，我们主要学习了三类动词：①be动词：amisare②情态动词:canmust③实义动词:have,go,like,want,come,play…下面我们分别来讲一下它们的用法。be动词be动词属于系动词,在一般现在时态的句子中主要表现为三种形式：am,is,are后面往往接形容词，名词或介词短语做表语。eg：(1)I’mfine.(fine形容词做表语)(2)Heisaboy.(aboy名词做
2、表语)(3)Mypenisintheschoolbag.(intheschoolbag介词短语做表语)(1)肯定句：be动词与主语保持一致(2)变为否定句：be后加not(3)变为一般疑问句：be动词往前提(4)变特殊疑问句：what,where,who,how,when…进行提问eg:Jennyisintheclassroom.否定：Jennyisn’tintheclassroom.一般疑问：IsJennyintheclassroom?特殊疑问：WhereisJenny?be动词用法歌我(I)
3、用am，你(you)用are，is连着他(he)，她(she)，它(it)；其余单数用is，复数全部都用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，句首大写莫迟疑。实义动词实义动词又称行为动词，实义动词所在句子中不存在be动词。实义动词所在的子变否定变疑问需要助动词do,does的帮助。eg:Ilikered.Helencomestoschool.Theyplaytennisball.（1）肯定句：“主谓一致”原则---当主语为第三人称单数时，谓语
4、动词要变成对应的第三人称单数形式。※动词第三人称单数的变化规则①、直接在动词后：+slike-likesplay-playslook-looks②、以s,x,sh,ch,接尾的动词：+eswash-washesteach-teaches③、以o接尾的动词：+esgo-goesdo-does④、以辅音字母+y接尾的动词：变y为i+esfly-fliesstudy-studies⑤、特殊词：have-haseg:drink-drinksgo-goesstay-staysmake-makeslook-
5、lookshave-haspass-passescarry-carriescome-comeswatch-watchesMike_______(like)cooking.They_______(have)thesamehobby.Myaunt_______(look)afterherbabycarefully.likeshavelooks(2)否定句：动词前加don’t/doesn’t，动词第三人称单数形式变回原形。eg:①Ihaveabluebook.（变为否定句）→Idon’thaveabl
6、uebook.②Hehasabrother.（变为否定句）→Hedoesn’thaveabrother.③Shewantstobeateacher.（变为否定句）→Shedoesn’twanttobeateacher.④Theyliketoplaybasketball.（变为否定句）→Theydon’tliketoplaybasketball.(3)一般疑问句：do/does放在句首，动词第三人称单数形式变回原形。eg:①Ihaveabluebackpack.(变为一般疑问句)→Doyouhav
7、eabluebackpack?②Mybrotherdoeshishomeworkbeforesupper.(变为一般疑问句)→Doesyourbrotherdohishomeworkbeforesupper?③Shewantstobeateacher.(变为一般疑问句)→Doesshewanttobeateacher?④Theyliketoplaybasketball.(变为一般疑问句)→Dotheyliketoplaybasketball?(4)特殊疑问句：特殊疑问词+一般疑问句。eg:①Yo
8、ursisterlikesEnglishbestbecauseit’sinteresting.(对划线部分提问)→WhydoesyoursisterlikeEnglishbest?②Hedoeshishomeworkbeforesupper.(对划线部分提问)→Whendoeshedohishomework?Specialremind特别提醒第一人称I，we在变疑问句时，应变为第二人称you。Practice1把下列动词变为第三人称单数形式1.clean--2.go—3.have--4.do--
