1、 小学英语语法:一般现在时讲解一. 意义:表示经常发生的事情,动作或存在的状态二. 构成及变化1.be动词的变化。肯定句:主语+be(am,is,are)+其它。如:I am a boy.我是一个男孩。否定句:主语+ be + not +其它。如:He is not a worker.他不是工人。一般疑问句:Be +主语+其它。 如:-Are you a student? -Yes. I am. / No, Im not.特殊疑问句:疑问词+一般疑问句。如:Where is my bike?2. 行为动词的变化。当主语为第一,二人称及复数时,助动词为do肯定句:主语+动词原形(+其它)。如:W
2、e often play basketball after school.否定句:主语+ dont+动词原形(+其它)。如:we dont play basketball after school.一般疑问句:Do +主语+动词原形+其它?如: Do you often play basketball after school l? Yes, we do. / No, we dont.特殊疑问句:疑问词+以do开头的一般疑问句? 如: What do you often do after school ?当主语为第三人称单数时 ,助动词为does肯定句:主语+动词三单式(+其它)。如: He
3、swims well.否定句:主语+ doesnt+动词原形(+其它)。如:He doesnt swim well.一般疑问句:Does +主语+动词原形+其它。如:Does he swim well ? Yes, he does. / No, he doesnt.特殊疑问句:疑问词+以does开头的一般疑问句?如: How does your father go to work?三.第三人称单数的动词变化规则(只有在第三人称为主语的肯定句中,动词才用三单式)(1)多数动词直接加s:runs gets likes collets takes plays climbs.(2)结尾是s, x, s
4、h, ch, o,前为辅音字母,结尾加es :watches teaches goes does washes crosses mixes brushes(3)动词末尾y前为辅音:将y改为i加es: studystudies flyflies carrycarries crycries但在y前如果为元音则直接加s:buys says四.时间标志:always , usually , often , sometimes ,every 现在进行时一.意义当表示现在正在进行的动作或正在发生的事。二.构成:be (am, is ,are )+动词现在分词-ing形式肯定句: 主语 + be + 现在分词V-ing (+ 其他) Im doing my homework now .否定句:主语+be+not+动词-ing +其他. Im not doing my homework now.一般疑问句:Be+主语+动词-ing +其他?Are you doing your home work now? Yes, I am . No , Im not . 特殊疑问句:特殊疑问词+be+主语+动词-ing+其他?What are you doing now ?