楼主要问的应该是“动名词”和“现在分词”吧
现在分词和动名词的构成形式是一样的,都是在动词后面加“ing”构成的
例如; working 在动词work后直接加ing
having 去掉动词have结尾的字母e后再加ing
beginning 以重读闭音节且只有一个辅音的字母结尾的动词,要双写这个辅音字母再加ing
现在分词是动词的一种非限定形式,主要起形容词和副词的作用,在句子中做定语,表语,状语.
例如：this is an amusing story.amusing在句中做定语,修饰story
the book is interesting.interesting 做表语 （相当于形容词）
the students came into the classroom laughing and talkjing .laughing和talking 做状语,表示一种状态.
动名词也是动词的一种非限定形式,顾名思义,它源于动词,又具有名词的功能,因此,它在句子中起名词的作用,可单独或引起短语（动名词短语）用作主语,表语,宾语.
例如：
learning a foreign language well is no easy job.(动名词短语learning a foreign language well在句中做主语)
my favorite sport is skating.(skating 在句中做表语)
have you finished correcting the students' paper?(correcting 做动词finish的宾语)
we had better put off discussing it until next week.(discussing 做介词off的宾语)