引导时间状语从句的词语主要有: when, while, as, after, before, since, ever since, until/till, whenever, as soon as, once, directly, immediately, instantly, hardly / scarcely… when, no sooner…than, the (very) minute / instant / moment, the first / second…/ last time, last/next/any/each/every time, by the time, all the time, the whole time等。
【考例1】
There is only one more day to go _______ your favorite music group play live.
A. since
B. until
C. when
D. before
解析：D。before在……之前。距你喜爱的音乐组合现场演出只有一天时间了。
【考例2】
The young couple, who returned my lost wallet, left _______ I could ask for their names.
A. while
B. before
C. after
D. since
解析：B。……我还没来得及问他们的名字，他们就已经走了。before 在……之前。
【考例3】
I have heard a lot of good things about you ______ I came back from abroad.
A. since
B. until
C. before
D. when
解析：A。自从我从国外回来，我已经听说了关于你的许多好事情。根据句意及主从句时态即可判断为A项。
考点二、条件状语从句条件状语从句常由if, unless, suppose/supposing (that), provided/providing (that), on condition that, as/so long as, given that, in case(如果)以及if only等词语引导。
【考例1】
You won’t find paper cutting difficult _____ you keep practicing it.
A. even if
B. as long as
C. as if
D. ever since
解析：B。只要你坚持练习剪纸，你就不会觉得它有多难。as long as 只要。
【考例2】
You will never gain success _____ you are fully devoted to your work.
A. when
B. Because
C. after
D. unless
解析：D。除非你全身心地投入工作中，否则你永远也不会获得成功。unless除非。
考点三、地点状语从句地点状语从句是表示主句谓语动作发生的地点的状语从句，引导词有where, wherever等。
【考例1】
Located _______ the Belt meets the Road, Jiangsu will contribute more to the Belt and Road construction.
A. why
B. when
C. which
D. where
解析：D。句意：位于“一带”和“一路”的交汇处，江苏将对“一带一路”的建设贡献更多。设空处引导地点状语从句，且在从句中作地点状语，因此用where引导。
【考例2】
A number of high buildings have arisen ______ there was nothing a year ago but ruins.
A. when
B. where
C. before
D. until
解析：B。 句意：在一年前还只是一片废墟的地方，许多高层建筑已经拔地而起。
【提示】引导地点状语从句时， where≠介词＋which；只有引导定语从句时, where =介词＋which。
考点四、 原因状语从句引导原因状语从句的连词主要有： because, since, as, now that等。
【考例】
Mark needs to learn Chinese ______ his company is opening a branch in Beijing.
A. unless
B. until
C. although
D. since
解析：D。根据句意：马克需要学习汉语是因为他的公司要在北京开分公司。连词since表示“由于，因为”｣ｬ符合语境。
考点五、目的状语从句引导目的状语从句的词主要有：so that, in order that, in case(以防，以备)等。
【考例1】
Leave your key with your neighbor ______ you lock yourself out one day.
A. as long as
B. even though
C. in case
D. as if
解析：C。 in case在句中意为 “以防，以备”，引导目的状语从句。
【考例2】
The police officers in our city work hard ______ the rest of us can live a safe life.
A. in case
B. as if
C. in order that
D. only if
解析： C。句意：我们城市的警察努力工作以确保我们其余的人能够过上平安的生活。
考点六、结果状语从句引导结果状语从句的连词主要有： so that, so...that, such...that等。
【考例】
The weather was ______ cold that I didn’t like to leave my room.
A. really
B. such
C. too
D. so
解析：D。天气太冷了，我不想离开我的房间。so 修饰形容词或副词与后面的that一起引导结果状语从句。
考点七、让步状语从句引导让步状语从句的词语主要有① although, though, while, as (虽然, 尽管)；② even if = even though (即使)；③no matter 疑问词=疑问词 ever(不管，无论)；④whether… (or…) (不管，无论……还是……)等。
【考例1】
______ some people are motivated by a need for success, others are motivated by a fear of failure.
A. Because
B. If
C. Unless
D. While
解析：D。根据句意可知上下文之间存在转折关系，所以用while连接，表示“尽管”。
【考例2】
_____ birds use their feathers for flight, some of their feathers are for other purposes.
A. Once
B. If
C. Although
D. Because
解析：C。句意：尽管鸟类使用它们的羽毛来飞行，可它们的羽毛中的一些有其他用处。根据句意可知，设空处引导让步状语从句，although表示“尽管”。
【提示】 ① although/though不与but连用，可与still或yet连用。
② 疑问词 ever (不管，无论)与no matter 疑问词的转换仅限于状语从句中。
③ even (副词)不引导让步状语从句； even so的意思是“即使如此”。
考点八、方式状语从句引导方式状语从句的连词主要有： as if/though, as, like, the way等。
【考例】
Jack wasn’t saying anything, but the teacher smiled at him ______ he had done something very clever.
A. as if
B. in case
C. while
D. though
解析： A。句意： 杰克什么也没说，但老师向他笑了笑，好像他做了件聪明的事情。
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