一般现在时的基本用法（讲义）沪教牛津版（深圳用）英语五年级上册

一般现在时的基本用法 1. 一般现在时的功能：1.表示事物或人物的特征、状态。如：The sky is blue.天空是蓝色的。 　　 2.表示经常性或习惯性的动作。如：I get up at six every day.我每天六点起床。 　　 3.表示客观现实。如：The earth goes around the sun.地球绕着太阳转。 二. 一般现在时的构成：1. be动词：主语+be(am, is, are)+其它。如：I am a boy.我是一个男孩。 注意：（我用am，你用are，三单is，复数are。） 　　 2.行为动词：主语+行为动词(+其它)。如：We study English.我们学习英语。 注意：（当主语为第三人称单数(he, she,it)时，要在动词后加"-s"或"-es"。 如：Mary likes Chinese.玛丽喜欢汉语。） 三．一般现在时的变化： 1. be动词的变化: ①肯定句：主语+be+其它。 如：He is a worker. 他是工人。 ②否定句：主语+ be + not +其它。 如：He is not a worker.他不是工人。 ③一般疑问句：be +主语+其它。(be动词移到句首) 如：Is he a worker? -Yes, he is. / No, he isn’t. ④特殊疑问句：疑问词+一般疑问句。 如：My bike is under the tree. → Is your bike under the tree? → Where is your bike? 2.行为动词的变化: ①肯定句：主语+动词原形(+其它)。 如：I like bread. ②否定句：主语+ don't( doesn't ) +动词原形(+其它)。 如：I don't like bread. ( 当主语为第三人称单数时，要用doesn't构成否定句。) 如：He often plays football. → He doesn't often play football. ③一般疑问句：Do( Does ) +主语+动词原形+其它。（句首加助动词do, does） 如：I often play football. → - Do you often play football? 　- Yes, I do. / No, I don't. (当主语为第三人称单数时，要用does构成一般疑问句。) 如：She goes to school by bike. →　--- Does she go to school by bike? 　　 --- Yes, she does. / No, she doesn't. ④特殊疑问句：疑问词+一般疑问句。 如：She goes to school by bike. → Does she go to school by bike? → How does she go to school? 四．动词变为三单形式的规则： 1．一般情况下，直接加-s，如：cook-cooks, milk-milks 2．以s. x. sh. ch. o结尾，加-es，如：guess-guesses, wash-washes, watch-watches, go-goes 3．以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies Practice 一、 写出下列动词的第三人称单数 come____________ watch___________ plant_____________ fly _____________ study____________ brush______________do_____________ teach____________ 二、用am, is, are 填空 1. I ________ a boy. ________ you a boy? No, I ________ not. 2. The girl__________ Jack's sister. 3. _________ your brother in the classroom? 4. Where __________ your mother? She __________ at home. 5. That ___________ my red skirt. 6.The jeans _________