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1、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)。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:playplays, wantwants, workworks, knowknows, helphelps,getgetsii)以字母s、x、ch或o结尾的动词加-es;如:guessguesses, fixfixes, teachteaches, brushbrushes, gogoes,dodoes,watchwatches,catchcatchesiii)以辅音字母y结尾的动词
2、,先变y为i,再加-es。如:studystudies,carrycarries,flyflies,worryworries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 factoryHis mother doesnt work in a factoryDoes his mother work in a factory?2)Mr Li teaches us EnglishMr Li doesnt teach us EnglishDoes Mr Li teach you English?3)My brother studies maths wellMy brother doesnt study maths wellDoes your brother study maths well?