第三人称单数的动词在句子中的用法
一般现在时的肯定句中，主语为第三人称单数的动词变化主要体现在词尾的变化上，其规律大体有三点：
1. 一般情况下，直接在动词词尾+s ，例如： get→gets; take→takes
2. 以s, sh, ch, x, o 结尾的动词，在词尾+ es，例如： teach→ teaches; fix→fixes; go→goes
3. 以辅音字母+ y 结尾的动词，变y 为i，再+ es，如：study→ studies; try→tries
除上述规律外，还应注意下面三点：
1. 动词 have ，遇到主语是第三人称单数时，要用 has； 动词 be 的第三人称单数形式是is。
2. 含有动词第三人称单数形式的句子变否定句时，要用 doesn't + 动词原形，如：
He goes to school at six in the morning. (变否定句)→ He doesn't go to school at six in the morning.
3. 对含有动词第三人称单数形式的句子提问时，要用助动词 does，如：
She goes home at five every day. (改为一般疑问句)→ Does she go ho at five me every day?
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在一般现在时中，当主语是第三人称单数时，谓语动词要用第三人称单数形式，即常在动词原形后加-s或-es。但有些同学们对于哪些主语是第三人称单数还不十分清楚，现归纳总结如下：
一、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。
二、单个人名、地名或称呼作主语；是第三人称单数。如：
①Han Mei looks like her mother. 韩梅看起来像她的母亲。
②Beijing is in China. 北京在中国。
③Uncle Wang often makes cakes. 王叔叔经常做蛋糕。
三、单数可数名词或\"this / that / the+单数可数名词\"作主语时，是第三人称单数。如：
①A horse is a useful animal. 马是有用的动物。
②This book is yours. 这本书是你的。
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③That car is red. 那辆小汽车是红色的。
④The cat is Lucy's. 这只猫是露茜的。
四、不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时，是第三人称单数。如：
①Everyone is here. 大家到齐了。
②There is something wrong with the watch. 这块手表有毛病。
③This is a pen. 这是一支钢笔。
④That is an eraser. 那是一块橡皮擦。
五、不可数名词作主语时为第三人称单数。如：
①The milk is in the glass. 牛奶在玻璃杯里。
②The bread is very small. 那面包很小。
六、当数字或字母作主语时，看作第三人称单数。如：
①\"6\" is a lucky number. \"6\"是个吉利数字。
②\"I\" is a letter. \"I\"是个字母。
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一、 写出下列动词的第三人称单数
drink ________ go _______ stay ________ make ________ look _________
have_______ pass_______ carry ____ come________ watch______ plant_______ fly ________ study_______ brush________ do_________ teach_______
二、用括号内动词的适当形式填空。
1. He often ________(have) dinner at home.
2. Daniel and Tommy _______(be) in Class One.
3. We _______(not watch) TV on Monday.
4. Nick _______(not go) to the zoo on Sunday.
5. ______ they ________(like) the World Cup?
6. What _______they often _______(do) on Saturdays?
7. _______ your parents _______(read) newspapers every day?
8. The girl _______(teach) us English on Sundays.
9. She and I ________(take) a walk together every evening.
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10. There ________(be) some water in the bottle.
11. Mike _______(like) cooking.
12. They _______(have) the same hobby.
13. My aunt _______(look) after her baby carefully.
14. You always _______(do) your homework well.
15. I _______(be) ill. I'm staying in bed.
16. She _______(go) to school from Monday to Friday.
17. Liu Tao _______(do) not like PE.
18. The child often _______(watch) TV in the evening.
19. Su Hai and Su Yang _______(have) eight lessons this term.
20. -What day _______(be) it today? - It's Saturday.
三、按照要求改写句子
1. Daniel watches TV every evening.(改为否定句)
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___________________________________________________
2. I do my homework every day.(改为一般疑问句，作否定回答)
________________________________________________________
3. 3. She likes milk.(改为一般疑问句，作肯定回答)
_______________________________________________________________
4. Amy likes playing computer games.(改为一般疑问句，作否定回答)
________________________________________________________
5. We go to school every morning.(改为否定句)
_______________________________________________________
6. He speaks English very well.(改为否定句)
___________________________________________________
9. She is always a good student.(改为一般疑问句，作否定回答)
________________________________________________________
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10. Simon and Daniel like going skating.(改为否定句)
___________________________________________________
四、改错(划出错误的地方，将正确的写在横线上)
1. Is your brother speak English? __________________
2. Does he likes going fishing? __________________
3. He likes play games after class. __________________
4. Mr. Wu teachs us English. __________________
5. She don't do her homework on Sundays. _______________
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