教学目标

1.owledge:wordsandusefulexpressions

Firstofall,once,unless,cupboardelectricityturnoff,shut,bythesideof,soap,taste,oil,mix,mixture,rather,finger,insteadof,second(n),onholiday,message,properAllow,experiment,basin,finally,lively,sadly,request,Petrol,castor,vinegar,dip,suck

2.MoralEducation:Togetthestudentstodoeverythingascarefullyastheycan.

3.EmotionalEducation:

Tosupplythestudentswithaveryharmoniousatmosphereinorderthattheycanhaveasuccessfulunderstandingofthetextanddiscussion.

MainPoints:ToletthestudentsmasterandusefreelysomeoftheusefuleverydayEnglish.

1.Herearesomedosanddon''''ts.2.Followtheinstructions.

3.What/Howaboutwhenweleave?4.Makesurethat......

5.Dowhatheorshetellsyoutodo.6.Pleasetidythelab.

7.Couldyoupleaseshowmehowtousethecomputer?

8.Don''''ttouchanything.

DifficultPoints:

1.Toencouragethestudentstodiscussandthenaskthemtodemonstratetheirideasbyusingtheimperativesentencestructure.

2.ToreviewandmasterthesentencestructureofDirectandIndirectSpeech.

3.once/unless/as连接的主从句

教学建议

Sincethedialogueandthetextofthisunitareaboutchemistry,theteachermayasksomequestionsaboutchemistryorothersubjectstoleadinthedialogueandthenshowthestudentsthetollsthatareusedinthechemistrylabwhenthetextistaught.

Andalsoinordertomaketheclassverylivelyandinterestingtheteachermayborrowthetubeswhicharefilledwiththreekindsofliquidsfromthechemistrylabandaskthemtoguesswhat''''sinthetubesandthenaskthemtowatchtheteachercarefullythendowhattheteacher.

Does,whichisthecontentofthetext.InthiscasethestudentsmayfeelverynewandtheymaybeinterestedinEnglishclass.

Inordernottocausesomethingdangeroustohappen,theteachermayfillsomewhitevinegar（白醋,somecookingoil(香油),somealcohol(白酒)inthetubes.

重点词汇讲解

1.firstofallmeansfirst.意为首先，第一

Firstofall,IwanttosayI''''mveryhappytobeherewithYou.

Firstofall,wemustmakeadecision.

相关的词组：atfirstwhichisoppositeto"atlast"forthefirsttime第一次

2．allow的用法

allow+noun.

allowsb.todo/nottodosth../sb.isallowedtodo

allow+doing

(1)Heallowednonoisehere.

(2)Heallowedhisboytospendtheweekendwithhisfriends.

(3)Whydidyouallowhertosmokehere?

(4)Wedon''''tallowdrinkingatschool.

3.once是连词，作“一旦……就……”讲。

(1)Onceshearrives,wecanstart.

(2)Onceyourealizeit,youwillstudyhard.

(3)Onceseen,itcanneverbeforgotten.只要见过一次就难以忘怀。

注意once一般和现在时连用。

4.unless是连词，相当于if……not……

(1)Hewillnotcomeunlesshishomeworkisfinished.==Hewillcomeifhishomeworkisfinished.

(2)Youwillbeintroubleunlessyoufollowmyinstruction.==Youwillnotintroubleifyoufollowmyinstruction.

unless和not…until的区别

unless引导从句时多强调条件，而not……until句型则强调时间。Unless连接的主从句的时态一般是主句是将来时而从句现在时。not……until连接的主从句中可以使用多种时态。

比较：

(1)Youwillfailintheexamunlessyoulistentotheteachercarefullyinclass.

(2)Wewon''''tstartuntilBobcomes.

(3)Hedidn''''tfindoutwhathadhappeneduntilhiswifetoldhimaboutit.

5.Don''''ttouchanythingunlessyourteachertellsyoutodo.

在此句末的to后省略了touch。在英语里，有些动词像hope,like,want,try,need,助动词如beableto.,begoingto之后，为了避免前后重复，往往只用一个to代表动词不定式。

(1)Youcangowithmeifyou''''dliketo.

(2)Youmaystayathomeifyouwantto.

(3)Idon''''twanttogothere,buthe''''sgoingto.

6.Whataboutwhenweleave?

Whatabout……?与Howabout……?可以用来询问消息、提出建议或征询意见，其后可接名词、代词、动名词、副词（如next）和状语从句等。

(1)I''''mready.Whataboutyou?

(2)Whataboutplayingfootball?

(3)Whatabouttoday''''smatch?

7.makesure后跟了一个省略了that的从句。当表示“弄确实、使确定”意思时，常用在祈使句中，其后的从句里要用一般现在时。当makesure表示“认为、确信”的意思时，其后的从句时态可视情况而定。

(1)Makesure(that)youcomeearlytomorrow.

(2)Makesure(that)yourroomisclean.

(3)Wemadesureyouwerenotcomingtoday.我们认为你今天一定不来了。

8.turnoff其反义词是“turnon"

turnup(开大)其反义词是turndown(关小)

9.attheendof/intheend

attheendof意为“在……末，在……尽头”，既可以表示时间的概念也可以表示空间的概念。而intheend只能表示时间的概念,其后不能接of短语，相当于finally,atlast.

(1)Attheendofthistermwewillhaveafinalexamination.

(2)Hediedintheendthoughthedoctorstriedtheirbest.

(3)Thereisahospitalattheendofthisroad.

10.with表示“具有，带有”

(1)Chinaisacountrywithasplendidcultureandalonghistory.

(2)Mr.Smithisamanwithtwosons.

(3)Iliveinahousewithtwowindows.

11.YoumustdoeverythingasIdo.

as为连词，表示方式，意思是“按照、如同”

(1)Statethefactsastheyare.要如实地陈述事实。

(2)Whydidn''''tyoudoasIasked?

like/as的区别

like表示“像、如同”的意思是介词，其后不能跟从句。而as是连词，要接一个从句。as当作介词时表示“作为”。

(1)Hedoesn''''tspeakasothersdo.(如、像)

(2)Hehasabignoselikehisfather.像）

(3)HeworksintheschoolasateacherofChinese.（作为）

12.insteadof/instead

insteadof是介词短语。意思是“代替、而不是”。其后可以接动名词、不定式、介词短语和名词、代词。可放在句首或句尾使用。

(1)Ifyouarebusy,letmegoinsteadofyou.

(2)Theywentthereonfootinsteadofbybus.

(3)ThissummerIwenttoQingdaoinsteadofgoingtoBeijing.

instead是副词。试比较。

(1)Parentsshouldgivetheirchildrenmoreadviceinsteadofmoney.

(2)Heneverstudies.Instead,heplaysalldaylong.

(3)Thestudentsdidn''''tsmile.Instead,eachofthemmadeaface.

13.taste/smell/sound/look/feel等感官动词的用法。其后必须加形容词。

(1)Theflowerssmellverynice.

(2)Theoldwomanlookedveryworried.

(3)Theclothfeelsverysoft.

(4)ThefoodtastessodeliciousthatIcantwaitanylonger.

14.Noneofyouwatchedcarefullyenough.

none为不定代词，意思是“没有一个人或物”。none做主语指代可数名词时，其谓语动词单复数形式都可以，但是当它指代不可数名词时，其谓语动词为单数第三人称形式。none常与表示范围的of介词短语连用并表示全部否定。

(1)Noneofthemhas/havegotabike.

(2)Noneofusis/areafraidoftheghosts.

(3)Noneofthismoneyismine.

(4)---Howmanyapplesdoyouhave?---None.

none/noone的比较

none既可以指代人也可以指代物，强调数量，可以用来回答howmany开头的问句。而用法与意思基本相同的noone(nobody)只能指代人，它们不强调数量，可以用来回答who开头的问句。

(1)----Howmanypeoplecanyouseeinthepicture?-----None.(一个也没有)

(2)---Whoisintheclassroom?----Noone.(Nobody)（没有人）

15.enough的用法

enough+noun./adj./adv+enough

enough可指代可数名词或不可数名词，其谓语动词形式可依据它指代的名词的数来定。

(1)Enoughhasbeensaidonthissubject.在这一点上说的已经够多的了。

(2)Enoughweresenttohim.Henolongerwantedtohavesuchbooks.

(3)----Wouldyoupleasehavesomemore?----No,thanks.I''''vehadenough.

(4)Iamafraidwehaven''''tgotenoughtimetodothework.

(5)You''''reoldenoughtolearntodressyourself.