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一、be动词的用法Be动词包括：am（过去式）,is（过去式）,are（过去式）I用，you用,复数都用，用在其他。一、口诀：我用am,你用are,is用在他她它，复数全用are。be动词的用法歌谣:be动词有三兄弟：is，am,are。I(我)用am,you(你)用are,is跟着he(他)she(她)it(它)，we(我们)you(你们)和they(他们)，复数（两人以上）永远连着are.解析:Iam;Youare;Heis;Sheis;Itis;Weare;Youare;Theyare.1.否定句只需要在be动词后加not,即:amnot,isnot=isn'tarenot=aren't2.一般疑问句只需要将be动词提前至句首.即:Is.......?Are........?例题：1.I______aboy.______youaboy?No,I_____not.2.Thegirl______Jack'ssister.3.Thedog_______tallandfat.4.Thejeans______onthedesk.二、人称代词和物主代词1．人称代词主格和宾格的区别：主格通常位于句中第一个动词之前（有时候位于than之后），宾格一般位于动词或介词之后。2．物主代词形容词性与名词性的区别：形容词性用时后面一般要带上名词，名词性则单独使用，后面不带名词。一.填写代词表主格。主格Iitwe宾格youthem名词性物主代词hisyour名词性物主代词hers三、有be动词的肯定句和否定句IamfromLondon.IamnotfromLondon.Heisateacher.Heisnotateacher.Sheisinthediningroom.Sheisnotinthediningroom.Myhairislong.Myhairisnotlong.Hereyesaresmall.Hereyesarenotsmall.归纳：在有be动词的句子中，改否定句时只要在be动词______加上_____。四、有be动词的一般疑问句AmIaChinese?Yes,youare.No,youaren’t.AretheyAmerican?Yes,theyare.No,theyaren’t.Isthecatfat?Yes,itis.No,itisn’t.五、Be动词在一般过去时中的变化：am--wasis--wasare--were⑴am和is在一般过去时中变为was。（wasnot=wasn’t）⑵are在一般过去时中变为were。（werenot=weren’t）⑶带有was或were的句子，其否定、疑问的变化和is,am,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。例题：1.I_______atschooljustnow.2.He________atthecamplastweek.3.We________studentstwoyearsago.4.They________onthefarmamomentago.5.YangLing________elevenyearsoldlastyear.6.Themobilephone_______onthesofayesterdayevening.六、therebe句型中be动词的用法1、在therebe句型中，主语是单数，be动词用is；主语是复数，be动词用are；如有几件物品，be动词根据最近be动词的那个名词决定。2、therebe句型的否定句在be动词后加not，一般疑问句把be动词调到句首。例题：1、There___________alotofsweetsinthebox.2、There___________somemilkintheglass.3、There____________-somepeopleunderthethebigtree.4、There___________apictureandamaponthewall.学习小结：1be动词的用法：我用_____;你用_____;______用在他她它;复数全用_____。2在有be动词的句子中，改否定句时只要在be动词______加上_____。改一般疑问句时，将________移到句首。3be动词在一般过去时中的变化：am--_______;is--________;are--________4在therebe句型中，主语是单数，be动词用________；主语是复数，be动词用___________；如有几件物品，be动词根据___________的那个名词决定。综合练习一.用所给词的适当形式填空。1.Thatisnot_________kite.Thatkiteisverysmall,but_________isverybig.(I)2.Thedressis_________.Giveitto_________.(she)3.Isthis_________watch?(you)No,it’snot_________.(I)4._________ismybrother.________nameisJack.Look!Thosestampsare_________.(he)5._________dressesarered.(we)Whatcolourare_________?(you)6.Herearemanydolls,whichoneis_________?(she)7.Icanfindmytoy,butwhere’s_________?(you)8.Show_________yourkite,OK?(they)9.Ihaveabeautifulcat._________nameisMimi.Thesecakesare_________.(it)10.Arethese________tickets?No,________arenot_________.________aren’there.(they)11.Shall_________havealookatthatclassroom?Thatis_________classroom.(we)12._________ismyaunt.Doyouknow_________job?_________anurse.(she)13.Thatisnot_________pencil._________isathome.(he)14.Whereare_________?Ican’tfind_________.Let’scall_________parents.(they)15.Don’ttouch_______._______isnotacat,_______isatiger!(it)16._________sisterisill.Pleasegoandget_________.(she)17._________don’tknowhername.Wouldyoupleasetell_________.(we)18.Somanydogs.Let’scount_________.(they)19.Ihavealovelybrother._________isonly3.Ilike_________verymuch.(he)20.MayIsitbeside_________?(you)二、按要求改写下列句子。1.IamaChinese.（变为否定句）2.Thisgreenbagislight.（变为一般疑问句，并作肯定回答）3.Thereisanappleinthebag.(变为一般疑问句)4.TheyaredoingTaijiquan.（变为一般疑问句，并作否定回答）5.MumisgoingtocookChinesefoodtonight.(变为一般疑问句)6.TheyareAmy’sgrandparents.（变为否定句）7.It’sinthesouthofChina.（变为一般疑问句）8．Therearelotsofbusesandcars.(变为否定句)9.Thereweren’tanytelevisions.（变为肯定句）10.Sheisgoingtogotoshop.（变为一般疑问句，并作肯定和否定回答）