人教新目标八年级英语上册unit-10-if引导条件状语从句课件

IF引导的条件状语从句

IF引导的条件状语从句1if?Doyouknowthemeaningof......如果if?Doyouknowthemeaningo2Whatwillhappenif

youheatice?It

willmelt.If

I

heatice.WhatwillhappenItwillmelt.3Whatwillhappenif

youdropaglass?It

willbreak.If

I

dropaglass.WhatwillhappenItwillbreak4Whatwillhappenif

youstandintherain?I

willgetwet.If

I

standinarain.WhatwillhappenIwillgetwe5Whatwillhappenif

you

come

toschoollate?I

willmiss

someclasses.If

I

come

toschoollate.WhatwillhappenIwillmisss6WhatcanyouFIND?it

willmelt.If

I

heatice,it

willbreak.If

I

dropaglass,i

willgetwet.If

I

standinarain,I

willmiss

classes.If

I

come

toschoollate,ifclause从句main

clause主句一般现在时一般将来时WhatcanyouFIND?itwillmelt7Itwillbe

sunnytomorrow.Wewillhave

atriptomorrow.We

willhave

atrip

if

it

is

sunny

tomorrow.If引导一个条件状语从句来谈论“可能的行动导致的可能的结果”。如果主句用_________时，则从句用_________时，简称“主将从现”一般将来一般现在Itwillbesunnytomorrow.Wew8语法：例句：Ifpeopleobeythetrafficrules,therewillbefeweraccidents.

if引导的条件状语从句if:从属连词，意思是：“如果，假如，倘若”→从句→主句if引导的条件状语从句既可以放在句子前，也可以放在句子后。

‘If+从句(一般现在时)主句(一般将来时)If

we

donotprotect

giantpandas,they

willdie.“主将从现”语法：例句：Ifpeopleobeythe9IfI

come

toschoollate,Iwillmisssomeclasses.Iwillmiss

someclasses

ifIcometoschoollate.orWhatwillhappenif

you

come

toschoollate?IfIcometoschoollate,Iwi10Itisgoingtoraintomorrow.Iwillstayinbed.If

it

rains

tomorrow,

I

willstay

inbed.ifI

willstay

inbed

ifit

rains

tomorrow.orItisgoingtoraintomorrow.I11→主句谓语中也可以含有情态动词，

如：must,can,could,should等

→主句谓语中也可以用hadbetter(not)do,提建议

例句：如果交通指示灯是红的，你必须停下来等一等。Ifthetrafficlightsarered,youmuststopandwait.例句：如果你想减肥，你最好锻炼。

Ifyouwanttoloseweight,youhadbettertakesomeexercise.→主句谓语中也可以含有情态动词，

如：must,can,co12

1.在if引导的条件状语从句中，当主句是一般将来时时，不能够使用begoingto结构，而要用will。

I’llhelpyouwithyourEnglishifIamfreetomorrow.

如果明天我有空，我会帮你学英语。

2.在if引导的条件状语从句中不能够使用some，而要用any。

Ifyouhaveanyquestionstoask,pleasecometomyoffice.如果你有问题要问的话，请到我办公室来。

注意事项注意事项132Givesomeadvice！！！

ApoorWilliamneedsouradviceabouthisproblems.2Givesomeadvice！！！ApoorW14William’sproblems1.Isometimesbringthewrongbookstoschool.Ifyoucheckyourtimetableeverynight，youwillknowwhichbookstobring.William’sproblemsIfyoucheck152.Iwasawayfromschooltoday,Idonotknowwhathomeworktodo.Ifyoucallyourfriends,theywilltellyouwhathomeworktodo.William’sproblems2.Iwasawayfromschooltoda163.Ihategettingup,Ialwaysfeeltiredinthemorning.Ifyougotobedearly,youwillnotfeeltiredinthemorning.William’sproblems3.Ihategettingup,Ialways174.Idonotknowwhatthiswordmeans.Ifyoulookitupinthedictionary,youwillfindoutitsmeaning.William’sproblems4.Idonotknowwhatthiswor181.___________(make)thewheelsround(圆)，they__________easily.(turn)ifyoumakewillturnHowtomakethewheelsrun?1.___________(make)thewheels192.Theseeds______________________inthesoil.(grow/plant)willgrowifyouplantthemHowtomaketheseedsgrow?2.Theseeds__________________203.____________anotherwing,it______.(puton/fly)ifyouput

onwillflyHowtomaketheplanefly?3.____________anotherwing,214.________________yourcoat,you__________socold.(puton/notfeel)IfyouputonwillnotfeelHowtomakehimnotfeelcold?4.________________yourcoat,225.Themeat_________________________inthefridge.(notgobad/put)willnotgo

badifyouputitHowtomakethemeatnotgobad?5.Themeatwillnotgobadif236.You__________________________yourclasses.(seeclearly/wear)willseeclearlyifyouwearHowtoseeclearly?6.You________________________24ExerciseBeforeExerciseAfterExercise3ExerciseBeforeExerciseAfter25If引导的条件状语从句的练习1IfI_____________(notunderstand）,Iwillaskmyteacherforhelp.IfI__________(copy)yourhomework,Iwillcheatmyself.3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4Ifyourmother_______(buy)thebookforyou,itwillbegoodforyourstudy.

don’tunderstand

copy

doesn’tget

buysIf引导的条件状语从句的练习1IfI________265.Ifyou____________(notwork)hard,you_________(notpass)theexam.6.Ifshe________(mend)thecomputer,herfather___________(notblame).7.Ifyourbrother____________(break)thewindow,hewillfeelverysorryforthat.8.Ifthecomputer

(notwork),menditplease.don’tworkwon’tpassmendswon’tblamebreaksdoesn’twork5.Ifyou____________(notwor279.Ifshe_____(notbe)interestedinmath,shewillfinditveryboring.10.Ifyou_____(get)highscores,yourparentswillbeproudofyou.11.Ifyou_____(be)happy,wewillbehappy.12.Ifshe

(translate)thesentencewordbyword,she________(get)itstruemeaning.isn’tgetaretranslateswillget9.Ifshe_____(notbe)intere281.Ifyou_____totheparty,you’llhaveagreattime.A.willgo

B.went

C.go

D.going2．

I____hertheanswerifshe____me.A.cantell,willask

B.willtell,willask

C.wouldtell,ask

D.willtell,asksCD3.–Whatareyougoingtodotomorrow?

--We’llgotothelibrarytomorrowifit___.A.isn’train

B.rain

C.won’train

D.doesn’train4.Whatwillyoudoifyou_____totheoldfolk’shomevisit?A.go

B.went

C.going

D.willgoAD1.Ifyou_____totheparty,y29WhydoIwanttogotoBeijingZoo?1.IfI___(go)toBeijingZoo,I________(learn)alotaboutanimals.2.IfI______(arrive)atnoon,I______(see)thefeedingofanimals.3.IfI____(find)theMonkeyHill,I________(have)funthere.gowilllearnarrivewillseefind

willhaveWhydoIwanttogotoBeijing304.IfI_____(watch)theanimalscarefully,I______(get)enoughinformationformyclassreport(报告).5.IfI_____(finish)myreport(报告),I______(be)veryhappy.

watchwillgetfinishwillbeWhydoIwanttogotoBeijingZoo?4.IfI_____(watch)theanim31Fillintheblanks1.IfEddie____(die),noone________(look)afterHobo.2.IfEddieandHobo_________(nothave)enoughfood,they________(share)it.3.Wildanimals______(be)indangerifhunters____(keep)killingthem.

dieswilllookdon’thavewillsharewillbekeepFillintheblanks1.IfEddie324.We_______(keep)pandassafefromdangerifwe_____(build)morereserves.5.You______(see)somesquirrelsifyou__(go)tothezoo.6.Thebabypanda______(live)onhisownifhismother_____(leave)himfortwowholedays.willkeepbuild

willseegowillliveleavesFillintheblanks4.We_______(keep)pandassa337.Ifwe____(build)thegiantpandareserves,we____________(encourage)themtoleave.8.Ifwe_______(notdo)anything,soonthere______(be)nopandasintheworld.buildwillencouragedon’tdowillbeFillintheblanks7.Ifwe____(build)thegian34拓展：当主句的动作表示真理或必然的结果时（结果一定会发生），主句和if引导的条件状语从句时态都用一般现在时。1.Ifyouheatice,it

turnsintowater.如果你把冰加热，它就会化成水。2.Ifyou

droptheglassonthefloor,itbreaks.如果你把玻璃杯摔落在地上，它就会破碎。拓展：35

if的反义词：

if...not...=unless,“如果不，除非”

Iwon’tgothereunlessIhearfromyou.(同义句)Iwon’tgothere_____I_____hearfromyou.ifdon’t

Iwon’tgotothepartyifIamnotinvited.(同义句)Iwon’tgototheparty_____Iaminvited.unlessif的反义词：Iwon36变换：1.有if引导的条件状语从句的复合句中，当主句和从句的主语均为you时，可转换为“祈使句，and+简单句”或“祈使句，or+简单句”Youcanpasstheexamifyouworkhard.----------------，andyouwillpasstheexam.Ifyoudon'thurryup,youwillbelateagain.Hurryup,------youwillbelateagain.Workhardor变换：1.有if引导的条件状语从句的复合句中，当主句和从句的372.借助介词with或without来转换。例如:

Ifyouhelpme,I’llfinishmyjobsoon.

-----------,I’llfinishmyjobsoon.如果你帮我，我将很快完成我的工作。

Ifthereisnowater,fishmaydie.

Fishmaydie-------------.如果没有水，鱼可能会死。Withyourhelpwithoutwater变换：2.借助介词with或without来转换。Withy38

if

引导的条件状语从句与if引导的宾语从句的区别if引导的条件状语从句与if引导的宾语从句的区别39if?Doyouknowthemeaningof......如果是否if?Doyouknowthemeaningo40If在宾语从句中翻译为“是否”If

在条件状语从句中翻译为“如果”I’llgotoseeyouifIamfreenextweek.

Iwanttoknowifheisateacher.whether1.if在句中的含义不同

if

引导的条件状语从句与if引导的宾语从句的区别If在宾语从句中翻译为“是否”I’llgotosee412.if在从句中的位置不同If引导的宾语从句放在主句之后；if引导的状语从句可放在主句之前也可放在主句之后用”，“隔开=Ifitdoesn’train,Iwillgoouttomorrow.Iwillgoouttomorrowifitdoesn’train.Idon’tknowifthetrainhasarrived.2.if在从句中的位置不同If引导的宾语从句放在主句之421.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Ican’tguessifshewillbeangry.4.Ifwehelpeachother,webothwillgetgoodresults.

判断：if

引导的条件状语从句与if引导的宾语从句1.Canyoutellmeifshecan433.时态要求上有区别If

引导条件状语从句的时态为一般现在时记住“主将从现”

1.Iwantedtoknowifthere

asportsmeetingnextmonth.doesn’trainwouldbe2.Ifit

,we’llholdit.If引导的宾语从句的时态由主句及本身时态决定3.时态要求上有区别If引导条件状语从句的时态为一般现在441.if在句中的含义不同2.if在从句中的位置不同3.时态要求上有区别明白吗

if

引导的条件状语从句与if引导的宾语从句的区别1.if在句中的含义不同2.if在从句中的位置不同345Exercises

Hewillhelpmewithmymathsifhe____free.AwasBwillbeCwouldbeDisIdon’tknow_____hewillcometomorrow.____hecomes,I’lltellyou.Aif;WhetherBwhether;WhetherCif;ThatDif;If3.Pleasetellhermytelephonenumberifshe_____(want)toknow.wantsDDExercisesHewillhelpmewit468.---Wouldyoupleasetellme____next?---Thinkitover.You’llfindag