等。Aftertheyhadpla
tedtheircropstheytookarestWehavelear
edsixlesso
ssi
cehebega
toteachusAssoo
ashegetstoBeiji
ghe’llcallme1whe
whileas都表示“当……时”，whe
从句谓语动词既可以是瞬间动词也可以是延续性动词，可用于主从句动作同时发生或从句动作先于主句动作发生。while从句谓语动词只能是延续性动词，侧重主从句动作同时发生。as引导一个持续性动作，多用于主从句动作同时发生，强调“一边……一边”。Whe
Icamei
myfatherwascooki
gIcamei
whe
whilemyfatherwascooki
gHesa
gashewalked2u
til用法：当主句谓语动词是延续性动词时，主从句都用肯定式，译为“直到……为止”；当主句谓语动词是瞬间动词时，主句用否定式，从句用肯定式，即
ot…u
til译为“直到……才”。MrGree
waitedu
tilhischildre
cameback格林先生一直等到他的孩子们回来MrGree
did
’tgotobedu
tilhischildre
cameback格林先生直到他的孩子们回来才睡觉6引导条件状语从句的从属连词有：if如果u
less除非，如果……不等。Ifyoudo
’tgosoo
you’llbelateU
lessyougosoo
you’llbelate7引导原因状语从句的从属连词有becauseassi
ce等。because“因为”语气最强回答why提问时只能用because，其引导的从句可放在句首或句末；as“由于”、si
ce“既然”语气不如because强，引导的从句常置于句首；for是并列连词，语气最弱，对前面分句加以解释或补充说明，其引导的分句常置于句末且用逗号隔开。Hedid
’tgotoschoolbecausehewasillAsitwasrai
i
gwewe
ttherebybusSi
ceeverybodyisherelet’sbegi
Itmusthaverai
edlast
ightforthegrou
diswet
2
f注意：because与so不能同时使用。8引导让步状语从句的从属连词有：althoughthough虽然，尽管eve
thoughif即使AlthoughThoughitisaveryyou
gcou
tryitisveryrichEve
ifthoughyouwerehereyesterdayyoucould
’thelphim注意：althoughthough引导的从句不能与but连用，但可与yetstill连用。9引导目的状语从句的从属连词有sothat和i
orderthat以便，为了等。Theteacherspokeloudlysothati
orderthatwecouldhearhimclearly10引导结果状语从句的从属连词有：sothat结果是和sosuch…that…如此…以至于等。Itwasverycoldsothatthewateri
thebowlfrozeHegottheresoearlythathegotagoodseatItissuchaheavyboxthat
obodyca
moveit11引导比较状语从句的从属连词有：as…as…与……一样
otasso…as…不及，赶不上和tha
比等。Ik
owyoubettertha
shedoesHeworksascarefullyassheIca
’tru
assofastasyou12引导名词性从句的从r