2019-2020学年度人教版选修六Unit 5The power of nature Period 3Learning about Language学案

　　 现在分词(v.­ing)作状语

　　v．­ing形式或 v．­ing短语作状语往往修饰谓语动词表示的动作，相当于相应的状语从句或并列句。

　　1．表示时间，作时间状语，相当于时间状语从句。

　　Walking along the street，I met my old classmate.

　　(＝While I was walking along the street，I met my old classmate.)我在街上走的时候碰到了老同学。

　　Turning on the light＝(When he turned on the light)，he was surprised to see his son lying on the floor.

　　他打开灯，惊讶地看见儿子躺在地上。

　　Entering the office(＝As soon as I entered the office)，I picked up the telephone and called Bob.

　　我一走进办公室，就拿起听筒给鲍勃打电话。

　　when/while＋动词的­ing形式强调其表示的动作和谓语动词动作同时发生。

　　Look out for cars when(you are) crossing the street.

　　过街时注意车辆。

　　Don't reach sideways while(you are) standing on a ladder.

　　站在梯子上时，不要侧着身子伸手去拿东西。

　　2．表示原因，作原因状语，相当于原因状语从句。

　　Being too young(＝As he was too young)，he couldn't join the army.因为太年幼，他不能参军。

　　Not knowing how to get there(＝As I did not know how to get there)，I had to ask the way.

　　因为不知道如何到那里，我只得问路。

　　3．表示条件，作条件状语，相当于条件状语从句。

　　Driving too fast(＝If you drive too fast)，you will damage the car.

　　如果你开车太快，你会把车子弄坏的。

　　Having more time(＝If I have more time)，I will do the work much better.

　　如果我有更多时间，我会把工作做得更好。

　　注意：表示条件时主要句子中的谓语动词往往用将来时或带有情态动词。

　　4．表示伴随状况或行为方式，这种用法没有相应的状语从句可以代替，但可以用并列复合句或两个简单句代替。

　　Thousands of students stood there，watching.(＝Thousands of students stood there and watched.)

　　成千上万的学生站在那儿观看着。(习惯上stand，sit，lie等表示主要行为须作谓语动词。应说stand watching，sit thinking，lie reading等，不宜说watch standing，think sitting，read lying等)

　　They came into the classroom，singing and laughing.

(＝They sang and laughed，and came into the classroom.)