动词第三人称单数形式主语有三单,动词也有三单,快点来习惯,体会在心里,一定要过关.一、概念动词第三人称单数：主语是第三人称单数，即谓语动词的发出者是it、she、he、可数名词单数、不可数名词等表示单数概念的词时，实义动词后面要加-s或-es。
（注意：若主语不是第三人称单数形式，就直接用动词原形；若主语是三单，后有will等情态动词修饰时，动词也用原形。
）二、动词三单变化规则（只有一般现在时才有第三人称单数）动词第三人称单数的变化规则及发音规律，同名词单数变复数大致相同，请认真观察。
1、大多数实义动词在词尾加“s”，在清辅音后发音为/ s / ，在浊辅音及元音因素后发音为/ z /。
如：speak→speaks /s/ ; come→comes /z/ ; play→plays /z/2、以辅音字母加“y”结尾的动词，要先将“y”变为“i”，然后再加“es”，读/z/。
如：study→studies /z/ ; fly→flies /z/3、以“s，x，ch，sh”结尾的动词，在词尾加“es”，发音为/ iz / 。
如：teach→teaches /iz/ ; watch→watches /iz/4、以“o”结尾的动词,在词尾加“es”。
常出现的两个以“o”结尾的动词go和do后加“es”，读/z/ 。
如：go→goes /z/ ; do→does /z/5、记住最为特别的be的三单is ；have的三单是has。
[注意]（1）下面两个动词变三单时，原词的元音部分的发音发生了较大的变化，要记忆。
如：do/du:/ →does/d z/ ; say/sei/ →says /sez/（2）以不发音字母“e”结尾的开音节词，如果尾音是[s]，[z]时，加“s”后字母“e”发音，与所加“s” 一起读做[iz]。
如：close－closes [iz]三、动词第三人称单数的句子结构。
1、肯定/否定句三单+is +表语. 三单+动词第三人称单数+其他.三单+is+not+表语 . 三单+doesn't +动词原形+其他.2、一般疑问句1）当谓语动词是be动词时，一般疑问句结构为“Is+三单+表语？”。
它的肯定回答为：Yes, 三单+is. ;否定回答为：No，三单+isn't.。
2）当谓语动词是实义动词时，在肯定句句首加助动词does,即“Does+三单+动词原形+ 其他？”。
它的肯定回答为：Yes，三单+does.;否定回答为：No，三单+doesn't.。
3、特殊疑问句特殊疑问词+一般疑问句四、要点1）一定要看准句子的主语是第三人称而且还是单数；2）经常与频率副词连用：always (一直，总是），usually（通常），often (经常），sometimes （有时），seldom (很少），hardly (几乎不），never (从不），once a day (一天一次），twicea week(一周两次），three times a month(一个月三次）。
如:I often speak Chinese. 我经常说汉语。
练习题I、写出下列动词的第三人称单数。
go do buy draw shoutplay teach make catch findswim jump begin dig helpmiss sing finish give keepdance worry sit hear matchget have love learn cryfly study come call smilebe write stop open checklook drink leave read pickeat walk start tell pushdie ________ live ________ show vote judgebuy _____ carry______ borrow listen washII、用动词的正确形式填空。
1、I _____ (go) home by bus.2、Jack ______(go) home by bike.3、When ______(do)he get up?4、Her mum ______(run) to the goose.5、He________(do not)like apples.6、Sam______(put) it under his arm.7、The boy_______(chase) it. 8、Kitty______(watch)TV everyday.9、John can’t______(find) his watch. 10、Where _____(do)Grandma live?11、Miss Wang___(live) in America now. 12、The girls___(give) the key to Sally.13、That key ______(open) the old box. 14、She ______(say) “I like these puppets”.15、What_____(do)Alice find? 16、Which toy_____(do) she like?17、He doesn’t______(know)her name. 18.、Mike ________( cook ) in a restaurant .19、He_______( speak ) Japanese . 20、How does he______(go)to the post office? 21、He often ______( have ) dinner at home . 22、Liu Tao ____ ( do ) not like PE(体育）.23、She ______(do) homework by herself. 24、They _____ (do) homework by themselves.25、Kate _____ (walk) to school every day.26、Lucy and Lily ______ (walk) to school every day.27、David and Ben ______(be ) in Class Four ,Grade Seven .28、The girl ___________（teach）us English on Sundays.29、He______(feed)them at 8:00 in the morning.30、She ____( ride ) to school from Monday to Friday .31、We _____________ (not watch ) TV on Sunday .32、Su Hai and Su Yang _____(work ) in a shop(在商店）.33、There______( be) some water in the bottle(瓶子）.34、The giant（巨人）______(climb) up the beanstalk（豆茎）.35、Michael usually_____ (listen) to the radio in the morning.III、选择正确的单词填到括号里。
1、What does Candy __________(wants, want ) to be ?2、He shouldn't __________ (throw, throws ) rubbish on the floor(草地）.3、Peter ____________ (help, helps ) his mother with the housework(家务）.4、She never __________(run, runs ) in the library(图书馆）.5、We will _________(fly, flies ) kites on this Sunday .6、Tom and Mary _________(has, have ) pen pals in China .7、They _________(speaks, speak ) English after class.8、He _________(don't , doesn't ) get up early .9、What _________( do, does ) your father do ?10、Let us ___________(fly , flies ) kites on this Friday afternoon .IV、将下列句子改为第三人称He的句型（看例句）。
例句：I brush my teeth once a day .→He brushes his teeth once a day .1、I come from China. ___________________________________________2、You have a big black knife. _________________________________________3、What do you do ? __________________________________________________4、Our parents work in an office . ___________________________________________5、What color are your clothes ?_____________________________________________ V、A：用括号里所给词的适当形式。
1、The desk _________ ________ (have)four legs.2、She _____ _____ (do) her homework every day.3、Danny______ ______ (fall) and breaks his tail.4、He _____ _______ (live) in Shijiazhuang.5、He ______ _____ (need) a pair of shoes.6、Danny_______ _______ (see) the apple tree.7、She_______ _______ (come) from America.8、My mother and father_______ ______ (walk) to the office every day.9、Danny and her mother sometimes ______ _______ (go) for a walk after supper.10、The train______ ______ (leave) at 10:13 am.11、That hat ______ _______ (look) like a cat.12、Danny ______ ______ (hurt) his nose.B：用括号里所给词的适当形式。