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动词原形变动词三单变化规则规则动词原形第三人称单数形式一般动词在词尾加-s。在清辅音后读/s/在浊辅音或元音后读/z/在t后读/ts/在d后读/ds/helplikeswimlistenknowplaygetfindhelps/helps/likes/laiks/swims/wimz/listens/’lisənz/knows/nəʊz/plays/pleiz/gets/gets/finds/faindz/以字母s,x,sh,ch结尾的动词加-es,读/iz/。teachwashfixguessteacheswashesfixesguesses以o结尾的动词也加-es，读/z/godogoesdoes以辅音字母加y结尾的动词，先变y为i，再加-es，读/z/。studycarrystudiescarries备注：have的三单形式为has一．写出下列动词的三单形式：sitguessdiegorushreachtouchbrushflycopysayrunfixlivecryenjoyhavewishplaytieteachbuystudydrinkstaymakelookcarrycomewatchplantdo二、用括号内动词的适当形式填空。1.Heoften________(have)dinnerathome.2.DanielandTommy_______(be)inClassOnenow.3.We_______(watch)TVonMondays.4.Nick_______(go)tothezooonSundays.5.Thegirl_______(teach)usEnglisheverySunday.6.SheandI________(take)awalktogethereveryevening.7.Mike_______(like)cooking.8.They_______(have)thesamehobby.9.Myaunt_______(look)afterhisbabycarefully.10.Youalways_______(do)yourhomeworkwell.11.I_______(be)ill.I’mstayinginbed.12.She_______(walk)toschoolfromMondaytoFriday.13.LiuTaousually_______（help）others.14.Thechildoften_______(watch)TVintheevening.15.SuHaiandSuYangnever_______(take)lessonsonSaturday.