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1、一般现在时讲解一、定义与讲解一般现在时：表示经常性的事情，经常性的动作或一般性事实。时间状语：often 经常，usually通常，always 总是every每个sometimes 有时，at 在几点钟只有在第三人称单数用动词的“三单变化”，其他用动词的原形。三单变化：1.（1）直接在动词词尾加-s ask-asks work-works （2）以字母s, x, ch, sh或o结尾的动词，在词尾直接加-eswatch-watches wish-wishes fix-fixes do-does go-goes （3）以“辅音字母加 - y”结尾的动词，要先变y为i再加-es. try-tri
2、es study-studies cry-cries fly-flies2.不规则变化：be- is are have-has二、一般现在时用法1. 表示经常性，习惯性,永久性的动作或存在的状态.通常与副词sometimes, often, usually, always, every day (year, month ), once (twice, three times) a day,等时间状语连用。They usually go to school by bike. I take the medicine three times a day.2. 表示客观真理，科学原理，自然现象，等客观
3、事实或格言，谚语等。 The sun rises in the east and sets in the west every day.三、第三人称单数变化，现归纳总结如下：1.人称代词he, she, it是第三人称单数。如：He likes watching TV.他喜欢看电视。 She has lunch at twelve.她十二点吃午餐。It looks like a cat.它看起来像只猫。2.单个人名、地名或称呼作主语；用第三人称单数。如：Han Mei looks like her mother.韩梅看起来像她的母亲。Beijing is in China.北京在中国。Uncl
4、e Wang often makes cakes.王叔叔经常做蛋糕。3.单数可数名词或this / that / the/ a +单数可数名词作主语时，是第三人称单数。如：A horse is a useful animal.马是有用的动物。 This book is yours.这本书是你的。That car is red.那辆小汽车是红色的。 The cat is Lucys.这只猫是露茜的。4.不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时，视为第三人称单数。Everyone is here
5、.大家到齐了。 There is something wrong with the watch.这块手表有毛病。This is a pen.这是一支钢笔。 That is an eraser. 5.不可数名词作主语时为第三人称单数。如： The milk is in the glass. 6.当数字或字母作主语时，看作第三人称单数。如6 is a lucky number.6I is a letter. 三、一般现在时的句子转换：（1）当句子中有be动词或情态动词时，则把be动词或情态动词(can,could等等)提到主语的前面变成疑问句;在be动词或情态动词后面加not变成否定句.例：陈述句
6、：She is a student. 疑问句 Is she a student? 否定句 She is not a student.陈述句：I can swim.疑问句 Can you swim否定句 I can not swim.（2） 当句子中即没有be动词，也没有情态动词时，则在主语前加助动词do (you,以及复数), does（单数she,he,it）变成问句；在主语后谓语动词前加助动词dont（I,you,以及复数), doesnt（单数she,he,it）变成否定句，助动词后的动词要变成动词原形。例：陈述句：We get up at 7:00 every morning.疑问句D
7、o you get up at 7:00 every morning?否定句We dont get up at 7:00 every morning.陈述句：She has a little brother. 疑问句 Does she have a little brother否定句 She doesnt have a little brother专项练习写出下列动词的第三人称单数形式。meet _ go _ bring _ make _ look _have_ pass_ take _ come_ watch_do_ fly _ study_ need_ teach_用括号内动词的适当形式填
8、空。1.He often _(have) dinner at home.2.We _(not watch) TV on Monday.3.Nick _(not go) to the zoo on Sunday.4._ they _(like) the World Cup?5.What _they often _(do) on Saturdays?6._ your parents _(read) newspapers every day?7.Miss Zhao _(teach) us English on Sundays.8.She and I _(take) a walk together e
9、very evening.9.There _(be) some water in the bottle.10.Mike _(like) cooking.11.They _(have) the same hobby.12.My aunt _(look) after her baby carefully.13.You always _(do) your homework well.14.I _(be) ill. Im staying in bed.15.She _(go) to school from Monday to Friday.16.Liu Tao _(do) not like PE.17
10、.The child often _(watch) TV in the evening.18.Su Hai and Su Yang _(have) eight lessons this term.19. He_ TV every evening. (watch)20.John _ like his father. (look)句型转换1. I go to school by bus. (用He做主语)_2. Kim plays baseball very well. (变一般疑问句)_3. She plays sports every day. (变否定句)_4. David doesnt l
11、ike French. （变肯定句）_5.They like watches. (变否定句)_6.Alan doesnt watch TV on school nights. （变肯定句）_7. We have time to do it. (变否定句)_8.John has a car. （对划线部分提问）_ _9. Do you have a pencil? (把主语改成she)_10.Sonia Hall likes hamburgers .(划线部分提问)11. I do my homework every day .(改为一般疑问句并作否定回答) you homework every day？ No,I .12. She likes milk.（改为一般疑问句并作肯定回答） she milk? Yes.,she .