说下3单和BE动词的用法和其他一些小学知识,

说下3单和BE动词的用法和其他一些小学知识,

一般现在时基本用法介绍
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.
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.）
一般现在时的变化：1. be动词的变化.
肯定句：主语+be+其它. 如：He is a worker. 他是工人.
否定句：主语+ be + not +其它. He is not a worker.他不是工人.
一般疑问句：Be +主语+其它.(be动词移到句首)
如：I am a student.
-Are you a student?
-Yes. I am. / No, I'm not.
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.
肯定句：主语+动词原形(+其它).
否定句：主语+ don't( doesn't ) +动词原形(+其它).
如：I like bread.
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 ofter plays football.
He doesn't often play football.
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.
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?
动词+s的变化规则
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
现在进行时
1．现在进行时表示现在正在进行或发生的动作,也可表示当前一段时间内的活动或现阶段正在进行的动作.（句中一般含有now, look, listen.）
2．现在进行时的肯定句基本结构为be+动词ing.
如：Tom is reading books in his study .
3．现在进行时的否定句在be后加not.
如：Tom is reading books in his study .
Tom is not reading books in his study .
4．现在进行时的一般疑问句把be动词调到句首.
如：Tom is reading books in his study .
Is Tom reading books in his study ?
5．现在进行时的特殊疑问的基本结构为：疑问词+一般疑问句?
（注意：当划线部分包含谓语动词时,用疑问词代替划线部分放到句首,原划线处应加上doing）
如：Tom is reading books in his study . Tom is reading books in his study .
Is Tom reading books in his study ? Is Tom reading books in his study ?
What is Tom doing in his study? Where is Tom reading books?
动词加ing的变化规则
1．一般情况下,直接加ing,如：cook-cooking
2．以不发音的e结尾,去e加ing,如：make-making, taste-tasting
3．如果末尾是辅音字母加一个元音字母和一个辅音字母,双写末尾的辅音字母,再加ing,如：run-running, stop-stopping