Section Ⅳ　Grammar & Writing

　　动词­ing形式作状语

　　阅读下列句子，体会黑体部分的用法

　　1．Will, still watching, saw the cat behave curiously.

　　2．When it had gone past he crossed the road, keeping his eyes on the spot where the cat had been investigating.

　　3．While sitting by a pool, Ferdinand sees a frog.

　　4．Before leaving his kingdom, he calls his son to him.

　　5．Not knowing her address, I can't write to her to express my gratitude.

　　6．Having lived with the girl for 5 years, we all know her very well.

　　一、基本用法

　　动词­ing形式作状语时，通常都表示主语正在进行的另一个动作(即动作­ing形式与主语在逻辑上存在主动关系)，用来对谓语动词表示的动作加以修饰或作为陪衬，它可表示时间、原因、条件、让步、结果、方式或伴随动作，相当于相对应的状语从句或and引导的并列句。

　　1．动词­ing形式作时间状语，多置于句首，也可置于句末。

　　Hearing the good news，they went wild with joy.

　　听到这个消息，他们高兴得发了狂。

　　Shopping in the mall，I came across my former classmate，Tom.

　　当我在商场购物时，我遇见了以前的同学汤姆。

　　2．动词­ing形式作原因状语，多置于句首或句末，也可置于句中。

　　Getting up late，he missed his early train.

由于起床晚了，他没有赶上早班火车。