句型16
while引导的从句
while除了有"当/在……时候"的意思外(注意：引导的句子谓语动词只能是延续性动词!)，另外的两层意思也是考查的重点： (1)while = although "尽管"、"虽然"，引导让步状语从句;(2)while的意思是"然而;可是"，常用来表达对比关系。
[例句]
While I admit that the problem is difficult, I don't think that they can't be solved.
尽管我承认这个问题很难，但是我并不认为无法解决。
While I admit his good points, I can see his shortcomings.
虽然我承认他的优点，我也能看出他的缺点。
While I was angry with her, I didn't lose my temper.
虽然我很生气，但我当时没有对她发脾气。
While I understand your viewpoint, I don't agree with you.
虽然我了解你的见解， 我还是不能同意(你)。
I earn only 120 dollars a week, while she earns 180 dollars.
我一星期只赚120美元，她却赚180美元。
句型17
where…(地点从句)
[注意]where引导地点从句时，可以引导定语从句或是逻辑地点状语从句。当它在定语从句中作地点状语，指代地点时，这时可以用in which, on which, at which, to which, from which等结构代替。但是它引导逻辑地点状语从句时，没有这样用法。
[例句]
You should put the book where it was. 把书放回原处。
Persistent people begin their success where others end in failure.不屈不挠者从他人失败的地方获取成功。
Where there is a will, there is a way. 有志者，事竟成。
Where men are greedy, there is never peace. 人类贪欲不止，世界和平无望。
[请比较下面的句子结构的不同]
Potatoes can be grown where it is too cold to grow rice.(本句where引导地点状语从句)
句型18
what引导的从句
what在英语中非常活跃,它可以用来引导主语从句、宾语从句、表语从句，但是不用来引导定语从句。在句子里可以充当主语、宾语、表语、定语，既可以指人，也可以指物。
[例句]
What is the population of the world? 世界的人口有多少?
What did you pay for this picture? 这幅画你付了多少钱?
What is most important in life isn't money. 人生最重要的并非是金钱。
Will you show me what you bought? 可以把你所买的东西给我看一下吗?
Mary is no longer what she was ten years ago. Mary已经不是10年前的她了。
句型19
as引导的非限制性定语从句
在as引导的非限制性定语从句中，连接代词as在句子中可以作主语、宾语或表语等，可以指人或物。其在定语从句中的位置比较灵活，即可以在句子 前面，在句子中间或句子末尾。常用的结构有：as we all know; as is well known to…; as is often the case; as is said/mentioned above; as has been said before; as I told you before; as is evident; as often happens; as can be seen; as is/was expected; as we expect; as I can remember等。
[注意1]as通常只指整个句子的内容，不表示部分内容。
[注意2]as引导的非限制性定语从句通常指"事先可以预料到的""料想到的"，表达"好"的方面。
[注意3]as引导限制性定语从句时，常构成the same…as…; such…as…; so/as …as…等结构。在从句中既可以指人、物，也可以指整个句子。
[例句]
This is also part of your work, as I told you before. 我曾告诉过你，这也是你工作的一部分。
The man was a teacher, as was evident from his way of speaking. 从那人说话的样子可明显看出，他是个老师。
Such ideas as he hits on are worthless. 像他那样偶然想起的主意是无用的。
It's the same story as I heard from her yesterday. 这故事跟我从她那儿听到的相同。
He will marry as pretty a girl as he can find. 他要尽可能找漂亮的女孩结婚。
Such people as have made great contributions to the world should be greatly respected.那些对世界做出巨大贡献的人们应该受到极大的尊重。
句型20
which引导的非限制性定语从句(也引导限制性定语从句)
which引导的非限制性定语从句既可以指整个句子内容，也可以指句子的部分内容(如单词或词组等)，在句子中可以作主语、宾语(动词或介词 的)、定语等。注意它在句子中的位置：只能放在主句后，不能放在主句前。表达的内容是"不好的"、"事先没有预料到的"等时，常用which，只指物。
[例句]
Yellowstone National Park, which is in Wyoming, is one of the most beautiful national parks in the world. 黄石国家公园位于怀俄明州，是世界上最美丽的国家公园之一。
The clock, which my grandfather bought, is still in good order. 这时钟是我祖父买的，现在还走时很准。
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