英语各种时态的概念和句型结构一、一般现在时、概念：表示经常性、习惯性的动作。、句型结构（）be(am,is,are)动词陈述肯定句：主语+be(am,is,are)+其它。陈述否定句：主语+be(am,is,are)+not+其它。一般疑问句：Be(am,is,are)+主语+其它？特殊疑问句：疑问词+一般疑问句？Who are they?反意疑问句：肯定陈述句+be(am,is,are)+not+主语（相应的代词）？Tom is a doctor, isnt he?否定陈述句，+be(am,is,are)+主语（相应的代词）？Tom isnt a doctor , is he?（）实义动词陈述肯定句：其他人称：主语+v.原形+其它。We go to the beach every Sunday.第三人称单数：主语+v.s+其它。Sally does her homework every day.陈述否定句：其他人称：主语+dont+v.原形+其它。We dont go to the beach
