单三不仅仅是人称把?为啥有些特指的名词后也加单三?中国是一个伟大的国家,有很悠久的历史,“有‘加单三吗?

Question

单三不仅仅是人称把?为啥有些特指的名词后也加单三?
中国是一个伟大的国家 ,有很悠久的历史 ,“有‘加单三吗?

Answer 1

三单形式”是指句子中主语为“单数第三人称”（如she,he,it等代词或The pen这样的名词）时,谓语动词要改变形式,一般在词后加s,（如stand--stands)以ch,sh,s,x等结尾的一般加es,(如wash--washes,fix--fixes)以辅音字母加y形式结尾的去y改ies(如fry--fries)
当主语是第三人称的时候谓语要用单三形式
还有就是当主语是动名词,不定式,或者是主语从句也用单三
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：
① Peter watches TV at 9:30.Peter 总是在9:30看电视.
② Beijing is in China.北京在中国.
③ My father often eats dinner at 7:00.我爸爸常常7:00吃晚饭.
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：
① A horse is a useful animal.马是有用的动物.
② This book is yours.这本书是你的.
③ That car is red.那辆小汽车是红色的.
④ The 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：
① Everyone is here.大家到齐了.
② There is something wrong with the watch.这块手表有毛病.
③ This is a pen.这是一支钢笔.
④ That 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：
① The milk is in the glass.牛奶在玻璃杯里.
② The 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.
第三人称单数形式的构成
1.一般直接在词尾加 s,如：want-wants like-likes read-reads play-plays eat-eats
2.以s,x,ch ,sh等结尾的单词加 es ,如：watch-watches teach-teaches miss-misses fix-fixes
4.以辅音字母加o结尾的单词,加 es 如:go-goes do-does
3.以辅音字母加y结尾的单词,变y为i加 es ,如：fly-flies
附加:have--has
动词单三的练习
一.根据括号里单词的适当形式填空
1.She _____ (be ) a writer.2.It _____(look) like a monkey.
3.We_____(go) to the park.4.He _____(go) to school.
5.Amy_____(like) eating fruits.6.Hebei_____(be) next to Shandong.
7.Our teacher _____(be) talking with John.8.Whose book _____(be) this
9.Dogs _____(be) our friends .10.That blackboard _____(be) clean.
11.The desk _____(be) Tom’s.12.Somebody _____(do) her homework .
13.Everybody _____(is ) ok!14.Nobody _____ (be) in the park .
15.There _____（be）someone in the classroom .
16.Uncle wang _____(watch) TV at home.17.Bob _____(read) book in the bookshop.
18.He_____（eat） breakfast in the morning .19.Ken _____(have) math class on tuesday.
20.“4” _____(be) a bad number in China .
二.把下列句子改成第三人称单数句的肯定句、否定句、一般疑问句,并做回答.
1.I like playing the pinao in the music room .(Tom)
2.I do my homework at 4:30 in the afternoon .（she）
3.I have breakfast at twenty-five past seven in the morning .(her father )
4.I watch TV at quarter past six with my parents .(Tom’s sister)
三、写出下列动词的第三人称单数形式
1.work_______ 2.watch_________ 3.clean________
4.write_______ 5.teach_________ 6.wash__________
7.play_______ 8.read________ 9.go__________
10.do__________ 11.fly________ 12.study________
13.drink _______ 14.cry_______ 15.have________
16.sit ____ 17.swim _____ 18.draw ______
19.make ____ 20.run _____ 21.carry _____
22.leave _____ 23.arrive ____ 24.watch _____
25.clean____ 26.walk_____ 27.stay_____
28.jump ____ 29.come _____ 30.pass_____
31.stand_____ 32.like ______ 33.love_____
34.smile_____ 35.laugh____ 36.know_____
37.speak______ 38.wear ____ 39.look____
40.drive_____ 41.skip ____ 42.eat____
43.buy____ 44.point_____ 45.live_____
46.say____ 47.want____ 48.talk_____
49.invite_____ 50.count____ 51.take____
52.brush ____ 53.stay _____ 54.need____
55.pack_____ 56.help _____ 57.find____