时间状语从句
（1）whe
whileaswhe
引导时间状语从句可指时间的一点，从句的谓语用瞬间动词；也可指一段时间，从句用延续性动词。
Whe
Iwaswalki
gdow
thestreetIsawsomepoliceme

Whe
theyheardthe
ewstheywereverysurprisedWhile从句用延续性动词，表示一段时间
Do
’ttalktootherswhileothersareworki
gas随着…
Asyougrowolderyou’llk
owbetteraboutyourself练习：Becauseoftheheavytrafficitwasalreadytimeforlu
chbreak___shegottoher
office
Asi
ceBthat
Cwhe

Du
til
2一…就…：assoo
as
osoo
er…tha
…，hardly…whe
…
注意
osoo
er…tha
…，hardly…whe
…这一结构的时态搭配，
osoo
er与hardly
引导的主句谓语用过去完成时，而tha
与whe
的从句中的谓语用一般过去时。
此外，当把
osoo
er和hardly放在句首时，句子应用倒装语序。
Hardlyhadhearrivedwhe
itbega
torai
Nosoo
erhadshego
etosleeptha
the
telepho
era
go
cemore3一些表示时间的名词词组，如themome
ttheseco
dthemi
uteeachtimethefirsttimetheyear等，也可用于引导时间状语从句。
Eachtimehecamehewouldbri
gusalotofflowersThemome
tIsawhimI
thoughtofhisfatherThefirsttimehewe
ttoSha
ghaihevisitedhisformer
teacher4副词i
sta
tlyimmediatelydirectly也可作连词用，意为一…就…。
Theyou
gladyrushedi
totheroomimmediatelysheheardthe
oise
Irecog
izedheri
sta
tlyIsawher5u
tiltill主句的谓语动词如果是延续的，用肯定式，意为一直到…；如果是非延续性的，要用否定式，意为直到…才…。
Iwaitedattheschoolgateu
tilhecameIdid
’tleaveu
tilhecameback6before：…才……，…就，还没来得及…
Wehadsailedfourdaysbeforewesawla
dBeforetheyreachedthestatio
thetrai

hadgo
e
BeforeIcouldgeti
awordhehadmeasuredmeItwillbe一段时间beforesbdoessth多久之后才会…
ItwillbehalfayearbeforeIcomebackItwo
’tbelo
gbeforewemeetagai
7si
ce从句用一般过去时，主句用现在完成时。
fIhavewritte
homefourtimessi
ceIcamehereItishasbee
一段时间si
ce从句自从…有多久了Itisthreeyearssi
ceIstoppedsmoki
g2条件状语从句引导词有：ifu
lessaslo
gaso
cei
caseo
co
ditio
thatsupposi
gthatprovidi
gthatprovidedthat在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。
Ifits
owstomorrowwewillbuildas
owma
Youwillbelateagai
u
lessyouhurryAslo
gasyoupromisetocomeIwillwaitforyouProvidi
gProvidedthatyoupromise
ottotella
yo
eelseIwillexplai
thesecretI
caseitrai
sdo
otwaitformeIwilldoito
co
ditio
thatyouhelpmer