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一般现在时一.含义：一般现在时表示经常、反复发生的动作或存在的状态．
2. 用法：1）表示经常、反复发生的动作，现存的习惯或状态。
I am a teacher. We are Chinese.
2）表示客观事实或普遍真理。例如：
There are seven days in a week. The earth goes round the sun.
3）表示安排或计划好的未来的动作，只限于go, come, leave, start, stay, return, arrive, begin, be 等动词。例如：
My train leaves at 6:30 this morning.-
How long do you stay here?
4）表示主语的特征、性格、能力等。
Tom studies very hard. She is always ready to help others.
二、.时间状语
一般现在时常和always, often, usually, every day/month/year,once a week,on Sundays sometimes等表示时间的状语连用．
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? 肯定回答：-Yes. I am. /否定回答： No, I'm 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。
1）、行为动词在一般现在时中的用法：一般人称的谓语动词用原形.，但单数第三人称做主语
时谓语动词词尾发生变化：即.动词词尾加-s；或.-es，
动词遇到单数第三人称时的表示方法
在一般现在时中, 当主语是单数第三人称时, 行为动词的形式是在词尾加-s 或–es具体方法如下：
(1)多数动词直接加s:
runs gets likes collets takes plays climbs……．
(2)结尾是s, x, sh, 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: study→studies fly→flies
carry→carries
cry→cries
但在y前如果为元音则直接加s: buys says
注意: 动词加-s 以后的读音.
1.在[p] [t] [k] [f] 等清辅音后，发清辅音/s/ eg. helps , works, likes,hates ,laughs
2.在浊辅音和元音后，发浊辅音/z/ eg. drives, cleans, plays
3.在[s] [z] [∫ ] [] 后，发/iz/ eg.rises, wishes, teaches, urges
4.在[t] [d]后，发/ts/ /dz/ eg. fits, sets, needs
5. 其他情况下发[z] eg. plans, cries, shows
2、.否定形式：主语是第三人称单数，在行为动词前加doesn’t. 行为动词变为原形。其余人称作主语时，都在行为动词前加don’ｔ
He likes reading books. 变否定句He doesn’t like reading books.
I like playing football. 变否定句I don’t like playing football.
3、.一般疑问句：主语是第三人称单数的，将助动词does提前，行为动词变为原形。其余人
称作主语，将助动词do提前，句号变问号。主语I ,we 变you ; some 变any .
1).He likes reading books. 变一般疑问句：Does he like reading books?
肯定回答：Yes, he does. 否定回答：No, he doesn’t.
2).I like playing football. 变一般疑问句：Do you like playing football?
肯定回答：Yes, I do.否定回答：No, I don’t.
3).We like nice flowers. 变一般疑问句：Do you like nice flowers?
肯定回答：Yes, we do.否定回答：No, we don’t.
一般现在时的四个基本句型总结
谓语动词是be 谓语动词是do
主语是：第三人称单数主语是：非第三人称单数
am/ is/ are does do
肯定句He is a teacher. He goes to school every day. They go to school every day.
否定句He is not a
teacher. He doesn’t go
to school every day. They don’t go to school every
day.
一般疑问
句
Is he a teacher? Does he go to school every day? Do they go to school every day?
Yes, he is. No, he isn’t.Yes, he does.
No, he doesn’ｔ
.
Yes, they do.
No, they don’t.
特殊疑问What is he? What does he do every day? What do they do every day?
