现在分词做宾语补语
可以用于这种结构的动词有hear, see, notice, watch等感官动词。
I saw the boy climbing the tree.
我看到那个孩子在爬树。
注：在这种结构中我们也可以用省略to的不定式，I saw the boy climb the tree.现在分词表示进行，而不定式表示有这么一回事。
过去分词做宾语补语
have sth. done或get sth. done表示让别人做某事。
you should have your TV set repaired.
你应该把你的电视送去修一下。
I will go to get my hair cut.
我要去理个发。
现在分词的时态
一般时 doing
完成时 having done
现在分词的完成时主要用于状语从句，强调分词的动作发生在谓语动作之前，简单地说，当状语从句的时态是完成时，我们在省略时，也用分词的完成时。
After he had waited for long time, he was asked into the office.
=Having waited for long time, he was asked into the office.
在等了很长时间之后，他被叫进了办公室。
Since I have never been to China I know little about the country.
=Never having been to China, I know little about the country.
因为没去过中国，我对那个国家知道的很少。
现在分词的被动语态
现在分词的被动 being done
现在分词完成时的被动 having been done
现在分词的被动语态和完成时的被动语态，主要用于做状语和定语。注意下列每对句子中分词与从句的时态和语态
Having been kept indoor for the whole morning , the children became impatient.
=As they had been kept indoor for the whole morning the children became impatient.