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动词第三人称单数的变化规律

动词第三人称单数的变化规律

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动词第三人称单数的变化规律

名词的复数变化规律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—getsii)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—catchesiii)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?