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Ioften/usually/sometimes…经常性、习惯性的发生的动作playfootballwatchTVcookChinesefoodstudyEnglishdohomeworkIoftenplayfootball.Heoftenplaysfootball.IoftencookChinesefood.HeoftencooksChinesefood.IoftenwatchTV.HeoftenwatchesTV.在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。1.一般情况下，直接在动词后+s，comeplaylikedrawreadcomesplayslikesdrawsreads2.以s,sh,ch,x,o结尾的动词，在词尾+eswatchteachwashgowatchesteacheswashesgoesIoftenstudyEnglish.HeoftenstudiesEnglish.3.以辅音字母+y结尾的动词，变y为i，再+esstudyflystudiesfliesIoftendohomework.Heoftendoeshomework.IoftenhaveanEnglishclass.HeoftenhasanEnglishclass.4.不规则变化动词have→do→hasdoesDoyouoftenplayfootball?Yes,Ido.No,Idon’t.Yes,hedoes.No,hedoesn’t.Doesheoftenplayfootball?Ioftenplayfootball.Doyouoftenplayfootball?Heoftenplaysfootball.Doesheoftenplayfootball.在一般现在时中，当主语是第三人称单数时，疑问形式？？当主语为第一二人称时，怎样变成疑问句？Ioftenplayfootball。Doyouoftenplayfootball?句子前加上doHeplaysfootball.Doesheplayfootball?句子前加does后还有什么变化SheoftenwatchesTV.Sheoftendoeshomework.DoessheoftenwatchTV?Doessheoftendohomework.Ioftenplayfootball.Idon’toftenplayfooball.Heoftenplaysfootball.Hedoesn’tplayfootball.在一般现在时中，当主语是第三人称单数时，否定形式？？1.HeoftenwatchesTV.Hedoesn’twatchTV.2.HeoftencooksChinesefood.Hedoesn’toftencookkChinesefood.对比变化Ioftenplayfootball.Idon’toftenplayfootball.Doyouoftenplayfootball?Heoftenplaysfootball.Hedoesn’toftenplayfootball.Doesheoftenplayfootball?