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：必修5 Unit 2（2） It looked splendid when first built! 刚建成时，它(圣保罗大教堂)看起来真是金碧辉煌！ 当从句的主语与主句的主语一致或主语为it，且谓语部分含有动词be时，这时可把从句的主语(或it)连同谓语动词be省略掉，省略后的部分为“when＋分词/介词短语/形容词/名词短语等”。 ①(2010·全国卷Ⅱ)Though_surprised to see us，the professor gave us a warm welcome. 教授看到我们虽然很惊讶，但是还是热情地欢迎了我们。 ②Look out for cars when_(you_are)_crossing the road. 在过马路时要注意车辆。 ③When (you are) in trouble，ask him for help. 遇到困难时可向他求助。Worried about the time available，Zhang Pingyu had made a list of the sites she wanted to see in London.由于担心时间不够，张萍玉早就把她想在伦敦参观的地点列了一张单子。 (1)worried about...为过去分词短语作状语，表原因。 Lost_in_thought，he almost ran into the car in front of him. 陷入沉思，他几乎撞上了前面的小汽车。 Addicted to the computer games，Jack fell behind the others. 迷恋于电脑游戏，杰克的学习落后于其他同学。 | 
