状语从句及连词
While是解!
◆常接持续性的动词，强调主从句谓语动作同时发生，常用进行时。有时还有对比意义，意为“然而”。
◆主句从句主语不同,表示“而…”
I do every single bit of housework __ my husband Bob just does the dishes now and then.
A. since                    B. while               C. when                D. as
◆While置于句首可表示As long as 或 Although
While there is life there is hope.
While I admit his good points, I can see his bad ones.

（2008湖南)______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
A. If          B. While     C. Because         D. As

〖2011四川卷〗      volleyball is her main focus, she’s also great at basketball.
A. Since        B. Once       C. Unless       D. While
虽然排球是她的主要项目，但她还擅长篮球。while“虽然，尽管”。答案D。

〖2010全国Ⅰ〗Mary made coffee ________ her guests were finishing their meal .
A. so that         B. although        C. while       D. as if
so that译为 “以便”表示目的, although译为 “尽管, 虽然”, as if译为 “好像”, while译为 “当….的时候”, 因此while符合句意, 选择C。

〖2009安徽〗—I wonder how much you charge for your services.
—The first two are free      the third costs $30.
A. while          B. until           C. when        D. before
while表转折 “而, 然而”。根据句子意思, 前两份免费, 而第三份要$30。

〖2006全国Ⅱ〗We thought there were 35 students in the dining hall,    , in fact, there were 40.
A.while           B.whether��      C.what         D.which
此题考查连词的用法。while在此表示转折, 意为 “但是, 而”。

〖2006天津〗The cost of living in Glasgow is among the lowest in Britain,      the quality of life is probably one of the highest.��
A.since           B.when           C.as           D.while
根据句中among the lowest in Britain和probably one of the highest可知前后的意义存在对比；while用作连词, 可用于表示对比或相反的情况, “而；但是”。

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