条件状语从句课件

grammarConditionalclausesgrammarConditionalclauses引导条件状语从句的连接词主要有：if(如果)、unless(除非)或aslongas(只要)等。条件状语从句引导条件状语从句的连接词主要有：if(如果)、unless(引导条件状语从句最常用的连词是if。

如果你请他帮忙,他会帮你的。Ifyouaskhim,hewillhelpyou.如果你考试不及格,你会让他失望的。

Ifyoufailintheexam,youwilllethimdown.如果你作业做完了就可以回家了。

Ifyouhavefinishedthehomework，youcangohome.条件状语从句引导条件状语从句最常用的连词是if。

条件状语从句unless=if...not.除非,若不,

除非下雨,比赛将照常进行。

Unless

itrains,thegamewillbeplayed.Ifitdoesn’train,thegamewillbeplayed.让我们出去散步吧，除非你太累了。

Let'sgooutforawalkunlessyouaretootired.

Ifyouarenottootired,let'sgooutforawalk.

条件状语从句unless=if...not.除非,若不,

条件状1.除非你早点动身，你就不能及时赶到那儿。Youwillfailtoarrivethereintimeunlessyoustartearlier．Youwillfailtoarrivethereintimeif

youdon’tstartearlier．

2.除非天气不好，我每天早晨都要去慢跑。Unlessbadweatherstopsme，Igojoggingeverymorning．Ifbadweatherdoesn’tstopme，Igojoggingeverymorning．3.除非你需要，我不会借钱给你的。

Iwon’tlendyoumoneyunlessyouareinneed．Iwon’tlendyoumoneyif

youarenotinneed．1.除非你早点动身，你就不能及时赶到那儿。3、so/aslongas只要

只要你保持书的清洁，你就可以把我的书借去。Youmayborrowmybookas/solongasyoukeepitclean.

只要你高兴，你做什么都没有关系。

So/Aslongasyou'rehappy,itdoesn'tmatterwhatyoudo.只要你努力，你就会成功。You’llsucceedas(so)longasyoutryhard.

条件状语从句3、so/aslongas只要

只要你保持书的清洁，时态问题

在条件状语从句中，要注意"主将从现"的规定，即主句用一般将来时，从句用一般现在时表示将来时。我有时间，我就来看你。Iwillcome

toseeyouifIhavetime.

条件状语从句时态问题

在条件状语从句中，要注意"主将从现"的规定，即主If从句（一般现在时），主句（一般现在时）表示科学常识，经常性的动作1.如果水被加热，它会变成蒸汽。Ifwaterisheated,itturnstosteam.2.如果我需要理发，我通常去我家附近的理发店。IfIneedahaircut,Iusuallygotothebarber’snearwhereIlive.3.如果天下雨，人们通常星期天不出门。

Peopleoftendon’tgooutonSundaysifitrains.If从句（一般现在时），主句（一般现在时）表示科学表示将来的可能性时，运用“主将从现”的原则。1.如果我得到这项工作，我将会买个手机。IfIgetthejob,I’llbuyamobilephone.如果我的家庭作业很难，我会叫Helen帮助我。2.Ifmyhomeworkisdifficult,I’llaskHelentohelpme.如果我今天下午有时间，我将去和同学踢足球。3.IfIhavetimethisafternoon,I’llgotoplaysoccerwithmyclassmates.表示将来的可能性时，运用“主将从现”的原则。1.如果我得到典型例题：Ifhe___inhalfanhour,we___waitforhim.

A.won'tcome

,won't

B.won'tcome,don't

C.doesn'tcome,won't

D.willcome

,don't

条件状语从句典型例题：条件状语从句误区提醒

if既可以引导条件状语从句，表示"如果"，也可以引导宾语从句，表达"是否"。辨别它在这两种从句中的时态是我们经常容易出错的地方。另外，if和unless的用法也需注意条件状语从句误区提醒

if既可以引导条件状语从句，表示"如果"1.If

it

____tomorrow,

we

____

to

climb

mountains.

A.

doesn’t

rain;

go

B.

won’t

rain;

will

go

C.

won’t

rain;

go

D.

doesn’t

rain;

will

go

2．—Do

you

know

if

________

tomorrow

morning?

—No.

I

will

call

you

if

she

________

back.

A.

she

will

come;

comes

B.

she

comes;

will

come

C.

will

she

come;

comes

D.

will

she

come;

will

come条件状语从句1.If

it

____tomorrow,

we

___3．We’ll

go

to

the

park

if

it_____

rain

tomorrow.

A.

don’t

B.

doesn’t

C.

won’t

4．We

are

not

sure

if

it

____

tomorrow.

If

it

____

,

our

sports

meeting

will

be

put

off.

A.

rains;

rains

B.

rains;

will

rain

C.

will

rain;

will

rain

D.

will

rain;

rains条件状语从句3．We’ll

go

to

the

park

if

it__5.

I’ll

give

the

book

to

him

as

long

as

he

___

here

next

Sunday.

A.

will

come

B.

comes

C.

is

coming

D.

came

6.You

will

not

get

good

grades______you

work

hard.

A.

and

B.

unless

C.

if

D.as

long

as

条件状语从句5.

I’ll

give

the

book

to

him

a40.

–WillyoupleasegivethedictionarytoJane?

–Sure,I’llgiveittoher_______shearriveshere.A.before

B.until

C.because

D.assoonas40.

–Willyoupleasegivethe37.Asnakebithim______hewenttoseeadoctoratonce.A.ifB.whereC.becauseD.so37.Asnakebithim______he28.

You

will

be

late

for

school________

you

don’t

get

up

early.

A.

but

B.

if

C.

and

D.

or28.

You

will

be

late

for

schoo34.Itwasrainingheavily,_____wedecidedtostayathomeandwatchTV.A.unless B.