牛津高一英語模塊1 Unit1學案1
常用的這種句式有：as we all know, as is known to all, as is said above, as is already mentioned above, as is often the case, as is reported in the newspaper等。
3.在非限制性定語從句中，修飾人并在從句中作主語時用關系代詞who, 作賓語時用關系代詞whom。
如：our guide, who was a french canadian, was an excellent cook.
she is like miss carter, whom i used to meet in boston.
二、 在下列情況下必須使用非限制性定語從句
1.當先行詞為專有名詞或球類、疾病、學科等獨一無二的事物時。
如： he caught sars, which threatened people a lot.
they will fly to paris, where they plan to stay two or three days.
football, which is now played in over 100 countries, is the most popular game in the world.
2.當主句內容完整，先行詞意義明確時。
如：his house, which was finished only a month ago, was burnt down to the ground last night.
we will put off the outing until next week, when we won’t be so busy.
3.當定語從句修飾整個主句時。
如：they have invited me to visit their country, which is very kind of them.
they moved the fallen tree, which took them a long time.
4.當定語從句修飾主句中的一部分時。
如：she was very patient towards the children, which her husband seldom was.
5.當定語從句由“代詞/數詞/名詞/形容詞比較級、最高級等＋of ＋which/whom”引導時。
如：china has hundreds of islands off its southeast coast, the largest of which is Chinese Taiwan.
chaplin directed a large number of films, most of which were silent.
三、 非限制性定語從句與限制性定語從句的區別
限制性定語從句，顧名思義，是對先行詞從本質或特征上進行限制的一種定語從句，它所修飾的詞代表一個（些）或一類特定的人或事、物。例如：a man who doesn’t want to learn from others can’t achieve much.
一個不向別人學習的人是不能指望有多大成就的。
a man被限定后，指一類特定的人。
限制性定語從句是不能去掉的，否則剩下的部分就失去意義而不能成立。非限制性定語從句則不然，它只對所修飾的詞作進一步的說明，去掉之后并不影響整個句子的含義。在形式上，非限制性定語從句與主句之
間通常必須有逗號隔開。
例如：finally we visited the giant yangtze gorges dam， which is the greatest key water control project in the world at present.
最后我們參觀了長江三峽大壩，它是目前世界上最大的水利樞紐工程。
本句若去掉定語從句，主句部分的含義仍然完整。歷年的高考題中，非限制性定語從句是出現頻率最高的考點之一，因此值得我們注意。
四、 引導非限制性定語從句的which可以指代前面的先行詞，也可以指代前面整個句子。
例如：that peter will marry alice， which has not been announced yet， has spread around.
彼特要娶愛麗斯這件事還沒宣布，卻已被傳得沸沸揚揚。