一般现在时主语单三人称时的动词变化
①在一般现在时中,当主语为第三人称单数时,动词要用“s”型(即第三人称单数形式)。②所谓动词“s”型的构成,可按名词变复数的规则来记,即:
i)在动词尾直接加 s。如:play-plays, want-wants, work-works, know-knows, help-helps,get-gets
ii)以字母s、x、ch或o结尾的动词加-es;如:guess-guesses, fix-fixes, teach-teaches, brush-brushes, go-goes,do-does,watch-watches,catch-catches
iii)以辅音字母+y结尾的动词,先变y为i,再加-es。如:study-studies,carry-carries,fly-flies,worry-worries③④强调如何将主语是第三人称单数的肯定句变为否定和疑问句。现举例说明(用划线部分来说明顺口溜):1)His mother works in a factory.His mother doesn’t work in a factory.Does his mother work in a factory?2)Mr Li teaches us English.Mr Li doesn’t teach us English.Does Mr Li teach you English?3)My brother studies maths well.My brother doesn't study maths well.Does your brother study maths well?
英语第三人称单数变化规律
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