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Unit5What dothey do语法梳理一般现在时的陈述句精讲精练（含答案）一般现在时表示经常性或习惯性的动作或表示现在的特征或状态，也可表示客观事实或普遍真理
一、第三人称单数的具体情况总结我们已经了解当主语是第三人称单数时，谓语动词要相应地使用第三人称单数形式那么如何判定主语是否是第三人称单数呢具体有以下分类.人称代词作主语1he,she,it.单个的人名、地名或称呼作主语例如
2.我的姐姐/妹妹在这里工作My sisterworks here可数名词单数或等+可数名词单数”作主语例如
3.“this/that/the/a这个男孩看上去很高兴This boylooks happy..这只兔子跳得高The rabbitjumps high不定代词等以及指示代词和作主语
4.someone,somebody,nobody,everything,something thisthat例如:,有人在课堂上说话Someone talksin class.不可数名词作主语例如5汤太烫了The soupis toohot..数字或者字母作主语例如
6.十三加七等于二十Thirteen andseven istwenty.特殊疑问句中，等疑问代词作主语例如7what,who谁住在这儿？Who liveshere什么让你高兴？What makesyou happy
二、一般现在时的肯定句基本结构为“主语+动词原形/动词第三人称单数形式+其他例如他喜欢游泳He likesswimming..我每天去上学I go to schoolevery day这只长颈鹿是如此的高This giraffeis sotall.李老师教英语Miss Liteaches English.
三、一般现在时的否定句.含有动词的句子，改为否定句时，在动词后加句中如有则改为例如1be benot,some any一Im a student.Fm notastudent.There issome milk.—There isn*t anymilk..含有情态动词（等）的句子，改为否定句时，在情态动词后加例如2can,should,would not一I cansing well.I can^/cannot singwell..含有行为动词的句子，改为否定句时，需要使用助动词或后加然后再接动词原形3do does,not,常缩写为常缩写为后接动词原形例如do not don,t,does notdoesnt,一My teacherbuys sometoys.My teacherdoesnt buy any toys.We makea fruitsalad together.—We don*t makea fruitsalad together.注意此处和作为助动词，本身没有实际意义作为实义动词时，意思是“做，干（某事）do doesdo/does例如一He doeshomework in the evening.He doesnt do homeworkin theevening.
四、动词第三人称单数一般现在时是英语中应用最广泛的时态之一，在一般现在时中，由于主语不同，动词会发生相应的变化.主语为第一人称、第二人称或第三人称复数时，动词为原形例如1I eatlunch attwelveo9clock.我在12点吃午餐你看上去很好看You lookvery nice..他们经常一起去上学They oftengoto school together苏海和苏洋通常在星期天放风筝Su Haiand SuYang usuallyfly kiteson Sundays..主语为第三人称单数（能用代替）时，动词用第三人称单数形式例如2he,she,it他帮助病人李老师英语说得好He helpssick people.Miss Lispeaks Englishwell.在一般现在时中，动词的第三人称单数变化规则如下分类例词读音一般情况下，在动词词尾直接S cook-cooks swim-swims在清辅音后读在浊辅音和元音s/s/,write——writes read——reads后读与和连起来时读和/z/;/t//d//ts//dz/以“元音字母结尾的动词，直一一一读（因为一般以“元音字母+y”play playssay saysbuy buysS/z/接在词尾加结尾的读音是元音）S+y”fly一flies study一studies y变i后读音不变,es读/z/以“辅音字母结尾的动词，变+y”carry——carries cry-cries为再加y ies以“辅音字母+0”结尾的动词，一go一goes do-does es读/z/般在词尾加es以“s,x,sh,ch”结尾的动词，一般es读/I z/修理guess-guesses fix-fixes在词尾加espush-pushes watch-watches不规则变化:和动词一have behave-has beis has/haez;hoz/is/i z/注部分动词变为第三人称单数时，原词的元音部分发音会发生变化，如do―does,say—sayso【考题精练】
一、写出下列动词的第三人称单数形式
1.find
2.stop
3.push
4.give_________
5.have
6.dance
7.read
8.skate_________
9.fly
10.work
11.play
12.live________
13.do
14.sit
15.wait
16.visit________
17.buy
18.go
19.study
20.come_________
二、用所给单词的适当形式填空
1.Jimlike hisnew sweater.
2.Let Helenhavea lookat thebook.
3.Juliawantsing anEnglish song.
4.Miss Wuteachus Englishthis term.
5.Su Haiand SuYangsleep for8hours aday.一
6.Wholive inNanjing inyour family一My brotherslivethere.
7.Mike oftengoswimin summer.一
8.—be yoursister acookNo,shebe.
9.Liu Taooftenplay tabletennis withWang Bing.Theybe happy.一一
10.Whatdo youruncledo Hebea doctor.
11.This childdonot havebreakfast in the morning.Its notgood forhim.
12.notdoeat anythinginthelibrary.
13.Tinado notplay tabletennis afterclass.
14.The twinsnotdo liketigers.But theylike lions.
15.The boydohis homeworkat home.
16.He sometimesgoto thepark anddrawpictures init.
17.My fatherand motheroftenwatch TVintheevening.
18.My uncleis acook.He cancook.good
19.Its verycold.The waterturninto ice.Lets goskate.
20.Helen alwayshavedancelessons on Sundays.
21.The girlsometimeschat withher e-friend onthe Internet.
22.Tinanot gotoschoolonSundays.Shesleep athome.
23.The teachersin ClassOnebe friendly.因为
三、按要求改写句子
24.My auntnotlookhappy,because mycousinnot dohishomework.改为否定句
1.They cansing anddance.They singdance.改为否定句
2.My fathergoes fishingon Saturdays.My fatheron Saturdays.改为否定句
3.Lily wouldlike tobuy somefish.Lily tofish..改为肯定句
4.Ben doesntspeak Chinesewell eitherBenwell.改为同义句
5.Wang Bingdraws well.Wang Bingdrawing.改为同义句
6.Mr Brownis amusic teacher.Mr Brown.改为同义句
7.Sam sendshis e-friends emails.Sam sendsemails.改为同义句
8.My friendoften goesto thecinema atweekends.My friendoften onand.参考答案
一、
1.finds
2.stops
3.pushes
4.gives
5.has
6.dances
7.reads
8.skates
9.flies
10.works
11.plays
12.lives
13.does
14.sits
15.waits
16.visits
17.buys
18.goes
19.studies
20.comes
二、
1.likes
2.have
3.wants;to sing
4.teaches
5.sleep
6.lives;live
7.goes swimming
8.Is;cook;isnt
9.plays;are
10.does;do;is
11.does
12.Dont
13.does
14.dont
15.does
16.goes;draws
17.watch
18.good;well
19.turns;skating
20.has dancing
21.chats
22.doesnt go;sleeps
23.are
24.doesnt look;doesntdo
三、
1.can*t/cannot;or
2.doesnt gofishing
3.wouldnt like;buyany
4.speaks Chinese;too
5.is goodat
6.teaches Music
7.to hise-friends
8.watches/sees films;Saturdays;Sundays。
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