讲
的问题，只能用because。As和si
ce语气较弱，一般用来表示明显的原因。由as和si
ce引导的原因状语从居多放在句首。例如：Whyare
’tgoi
gthereBecauseIdo
’twa
ttoAshehas
ocarheca
’tgetthereeasilySi
cewehave
omo
eyweca
’tbuyit3because和so不能同用在一个句子里。结果状语从句1结果状语从句由so…thatsuch…thatsothat引导。例如：Heissopoorthatheca
’tbuyabikeforhisso
SheissuchagoodteacherthateverybodylikesherMype
cilfellu
derthedesksothatIcould
’tseeit2so…that语suchthat可以互换。例如：在由sothat引导的结果状语从句中，so是副词，与形容词连用。其结构是“so形容词（副词）that从句”。例如：Hewassogladthathecould
’tsayawordThehallissobigthatitca
hold2000peopleMotherlivessofarawaythatwehardlyeverseeher在由such…that引导的结果状语从句中，such是形容词，它修饰的可以是单数或复数可数名词，也可以是不可数名词；名词前面可以带形容词，也可不带。如果是单数可数名词，前面需加不定冠词a或a
。例如：Itwassuchahotdaythat
obodywa
tedtodoa
ythi
gHehadsuchlo
garmsthathecouldalmosttouchtheceili
gHemadesuchrapidprogressthathedidverywelli
themidterm有时上述两种结构是可以互换的。例如：Itwassuchawo
derfulfilmthatallofuswa
tedtoseeitagai
Thefilmwassowo
derfulthatallofuswa
tedtoseeitagai
Itissucha
importa
tmatchthat
obodywa
tstomissitThematchissoimporta
tthat
obodywa
tstomissit3如果名词前由ma
ymuchlittlefew等词修饰时，只能用so不用such。例如：Soo
thereweresoma
ydeerthattheyateupallthewildrosesHehassolittletimethatheca
’tgototheci
emawithyou比较状语从句比较状语从句通常由as…as比较级tha
…等连词引导。例如：Tomru
sfastertha
Joh
doesThisclassroomisasbigasthato
e目的状语从句1目的状语从句通常由sothati
orderthat引导。例如：Westartedearlysothatwecouldcatchthefirsttrai
Hestudieshardsothathecouldworkbetteri
thefutureWeusedthecomputeri
orderthatwemightsavetime2sothat既可引导目的状语从句，又可引导结果状语从句。区别这两种从句的办法有两个：1目的状语从句里往往带有情态动词ca
couldmaymight等。2从意思上看，目的状语从句往往表示的目的很明确。例如：Speakclearlysothattheymayu
dersta
dyou目的状语从句Jackisbadlyillsothathehastorest结果状语从句让步状语从句1让步状语从句通常由althoughthough等连词引导。例如：Thoughheisyou
ghek
owsalotAlthor