Period Two Learning about Language 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 a...
