一、结构
（一）主语+be+……
1.陈述句肯定式（肯定句）：主语+be（am, is, are）+……，其中be（am, is, are）用法口诀如下：
I是am；
you是are；
is连着he, she, it；
单数用is, 复数全用are。
2.陈述句否定式（否定句）：主语+be（am, is, are）not+……，其中am not没有缩写形式；is not缩写为isn't；are not缩写为aren't。
3.一般疑问句：Be（am, is, are）+主语+……？其中I am……的一般疑问句常常变为Are you……? Yes，主语+be.（肯定回答） No,主语+be not.（否定回答）
主语+动词（行为动词，除了be）+…
主语（不是三单）+动词（原形）+…
陈述句肯定式（肯定句）：主语（不是三单）+动词（原形）+……
陈述句否定式（否定句）：主语（不是三单）+don't+动词（原形）+……
一般疑问句：Do+主语（不是三单）+动词（原形）+……？Yes，主语+do.（肯定回答）No，主语+don't.(否定回答）
主语（三单）+动词（三单）+……
主语三单即主语的第三人称单数形式；动词三单即动词的第三人称单数形式。动词三单的变化规则：
①一般情况下在动词后加s。
②以s, x, sh, ch, o结尾的动词在后面加es。
③以辅音字母+y结尾的动词，把y变为i，再加es。
* 例外的需要特殊记忆：be–is；have–has
陈述句肯定式（肯定句）：主语（三单）+动词（三单）+……
陈述句否定式（否定句）：主语（三单）+doesn't+动词（原形）+……
一般疑问句：Does+主语+动词（原形）+……？Yes，主语+does.（肯定回答）No,主语+doesn't.（否定回答）
二、用法
1.表示经常性的、习惯性的、反复发生的动作。常常和表示时间的频率副词often, always, usually, sometimes, never, every day等连用。如：I get up at six o'clock every day.
2.表示现在的状态，也可以用一般现在时态。如：The library is on the right of the classroom building.
3.在由when, before, after，as soon as, until，if等引导的时间状语从句或条件状语从句中， 用一般现在时代替将来时。如：If it is cloudy tomorrow, we'll stay at home.
4.表示客观事实或普遍真理，用一般现在时。如：The earth goes round the sun.
三、练习
（一）用括号中所给词的适当形式填空。
1.Where_____(be)your sister?
2.Lucy and I_____(be not)at school today.
3.She_____(come)from Class 3.
4._____they_____(play)football every day？
5.When_____Tom_____(get)up every morning?
6._____(be)Daming in Grade 9? Yes.
7.What lesson_____we_____(have)on Mondays?
8.How_____we_____(do)our homework on the computer？
9.The earth_____(go)round the sun.
10.She_____(not do)her homework every weekend.
（二）根据要求句型转换。
1.They are from Shanghai.（否定句）
2.She is in Class One.（划线提问）
3.It's twelve o'clock now.（划线提问）
4.My father often talks to his customers on the computer.（划线提问）
5.We always have birthday parties at a hotel.（划线提问）
6.She goes to the cinema every Friday.（一般疑问句）
7.Does Lucy do her homework every weekend?（陈述句）
8.He is an English teacher at a school.（否定句）
9.They don't listen to music on Thursday.（肯定句）
10.Maths is Tom's favourite subject.（划线提问）
（三）句子翻译。
1.他们来自哪里?
2.你喜欢地理吗？
3.我们周五不打篮球。
4.他们从来不做蛋糕。
5.如果明天下雨，我们就不去吃野餐。
6.她有时候上学迟到。
7.你间隔多久看一次电影？
8.他喜欢历史，因为它有趣。
9.这个女孩从来不玩电脑游戏。
10.他每天上网搜寻信息。
四、练习参考答案
（一）1.is 2.aren't 3.comes 4.Do play 5.does get 6.Is 7.do have 8.do do 9.goes 10.doesn't do
（二）1.They aren't from Shanghai.
2.What class is she in?
3.What time is it?/What's the time?
4.What does your father often do on the computer?
5.How long do you have birthday parties at a hotel?
6.Does she go to the cinema every Friday？
7.Lucy does her homework every weekend.
8.He isn't an English teacher at a school.
9.They listen to music on Thursday.
10.What is Tom's favourite subject?
（三）1.Where are they from?/Where do they come from?
2.Do you like geography?
3.We don't play basketball on Fridays.
4.They never make a cake.
5.If it rains tomorrow, we won't have a picnic.
6.She is sometimes late for school./She sometimes goes to school late./Sometimes she is late for school./Sometimes she goes to school late.
7.How long do you see a film/watch a movie?
8.He likes history because it's interesting.
9.The girl never plays computer games.
10.He searches for information on the Internet every day.
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