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B.comes;
willdo C.willcome;
does D.comes;
does
5.Ifyouhadenoughmoney,what_____
A.willyoubuy B.wouldyoubuyC.wouldyouhavebought D.willyouhavebought
6.ManyChinesemoviestarsnowhavegivenuptheirChinesenationality.IfIwerethem,I_____that.
A.shouldn’tdo B.didn’tdo C.hadn’tdone D.won’tdo
7.
If
there
no
buying
and
selling
of
animals,
killing
in
nature.
A.
is;
will
he
B.
be;
be
C.
is
D.
is
8.
Fm
waiting
for
my
friend.
I'
ll
go
shopping
alone.
she
comes
won'
t
come
doesn'
9.The
students
_______
have
a
sports
meeting
this
weekend
if
it
________。
A.
won’t;
rains
will;
rain
are
going
to;
to
rain
总结:
本次教学评价:
非常满意○较满意○一般○家长或学生签字共小时
本节课回访记录:
任课老师签字:
主任签字:
日期:
讲义
学生:
任课教师:
教学内容:
if条件句
Ifpeopleobeythetrafficrules,therewillbefeweraccidents.
结构:
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。
从句位于主句之前时,常用逗号将
其与主句隔开。
if:
从属连词,意思是:
“如果,假如,倘若”
原句可改为:
Therewillbefeweraccidentsifpeopleobeythetrafficrules.
时态:
if引导的条件状语从句,主句用一般将来时(will),从句用一般现在时(主将从现)。
Ifitrains(从句),Iwillstayathome.
I’llgowithyouifyoudon’twanttogoalone(从句.
如果主句是祈使句,从句要用一般现在时
Don’tgoandplayfootballifyoudon’tfinishyourhomework.
PleasecallmeifhecomesnextSunday.
主句谓语中也可以含有情态动词,如:
must,can,could,should等
【注意】主句谓语中也可以用hadbetter(not)do,提建议
Ifyoudrivetoofast,youmayhaveanaccident.
Youmuststopifthetrafficisred.
Ifthetrafficlightsarered,youmuststopandwait.如果交通指示灯是红的,你必须停下来等一等。
Ifyouwanttoloseweight,youhadbettertakesomeexercise.如果你想减肥,你最好锻炼。
练习:
用所给单词的正确形式填空
1.Ifyou_________(want)tolistentomusic,__________(choose)aCD.
2.Ifyou________(buy)anewcamera,_________(get)agoodone.
3.Ifthelight___________(notcome)on,_________(wait)foroneminute.
4.Ifit___________(notwork),__________(wait)aminuteandthen__________(try)again.
5.Ifyou__________(notknow)howtousethecamera,__________(read)theinstructions.
6.Ifyou________(feel)tired,you_______________(have)tohavearest.
7.Where_______he_________(see)thefilmifhe________________(have)time
8.Ifthere__________(be)fewertrees,there_______________(be)morepollution.
9.He_____________(dress)
morecasuallyifhe________________(notwork)onweekends.
10.IfMarcia_____________(live)alone,she___________________(keep)apetparrot.
【拓展】if的反义词:
if...not...=unless,意思是:
“如果不,除非”
1.Iwon’tgothereunlessIhearfromyou.(同义句)
Iwon’tgothere_________I___________hearfromyou.
2.Iwon’tgotothepartyifIamnotinvited.(同义句)
Iwon’tgototheparty_____________Iaminvited.
条件句的转换:
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.
2.借助介词with或without来转换。
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。
【注意】
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。
1.Ifyou_____aninterestingdayout,______theScienceMuseum.
A.want;
visiting B.want;
visit C.wantto;
visit D.wanting;
visit
2.Ifthepurewaterisheatedto100centigradedegrees,it______boil.
A.isgoingto B.will C.would D.isto
If条件句的虚拟语气:
表示说话人的愿望、假设、猜测或建议,而不表示客观存在的事实。
IfIwereachild,Iwouldbehappier.
Ifhewereabird,hecouldflyinthebigbluesky.
IfIhadalotofmoney,Iwouldbuyavilla(别墅).
时间
从句
主句
与现在事实相反
were/did(动词过去式)...
would/coulddo(动词原形)…
would/could/should+动词原形
1.Maryisilltoday.Ifshe_____,she_____absentfromschool.
A.werenotill;
wouldn’tbe B.hadbeenill;
wouldn’thavebeen
C.hadbeenill;
shouldhavebeenD.hadn’tbeenill;
couldbe
2.IfIknewyouwerecoming,I___youattheairport.
A.hadmetB.metC.wouldmeetD.wouldhavem