1. 動詞的ing形式包括動名詞和現在分詞，二者都可作表語。如：
Our job is playing all kinds of music . ( 動名詞 )
The music they are playing sounds so exciting . ( 現在分詞 )
註：一般來講，動名詞 ( 短語 ) 作表語，主表可互換，即：Playing all kinds of music is our job.
現在分詞作表語，表明主語的性質和特徵，主表不可互換。
2. - ing形式做定語可以表示
1 ) 所修飾名詞的用途
a waiting room ( = a room for waiting ) / a walking stick ( = a stick for walking )
2 ) 所修飾名詞正在進行的動作，可以換成定語從句形式
a waiting man ( = a man who is waiting ) / a sleeping child ( = a child who is sleeping )
3. 在see , hear , feel , watch , notice等感觀動詞後可以用 - ing形式做賓語補足語。這時 - ing形式和句子的賓語之間存在著邏輯上的主謂關係，並且 - ing形式表示賓語正在進行的動作。如：
He saw a girl getting on the tractor. ( = He saw a girl and the girl was getting on the tractor . )
Do you hear someone knocking at the door?
1).做賓語補足語We watched three boys sharing their food with each other.
2).做主語補足語She was heard singing in the next room.
3).做表語和定語My job is teaching English. /a walking stick/a waiting room
當-ing分詞做定語的時候，常常放在被修飾名詞的後面
The girl singing now is a classmate of mine.
4).做伴隨、原因、時間、結果狀語
He sat at the desk reading a magazine.
Being very young, he can't dress himself.
Having finished all the work, they went to the shore.
Her parents died, leaving her a big house.
Our job is playing all kinds of music . ( 動名詞 )
The music they are playing sounds so exciting . ( 現在分詞 )
註：一般來講，動名詞 ( 短語 ) 作表語，主表可互換，即：Playing all kinds of music is our job.
現在分詞作表語，表明主語的性質和特徵，主表不可互換。
2. - ing形式做定語可以表示
1 ) 所修飾名詞的用途
a waiting room ( = a room for waiting ) / a walking stick ( = a stick for walking )
2 ) 所修飾名詞正在進行的動作，可以換成定語從句形式
a waiting man ( = a man who is waiting ) / a sleeping child ( = a child who is sleeping )
3. 在see , hear , feel , watch , notice等感觀動詞後可以用 - ing形式做賓語補足語。這時 - ing形式和句子的賓語之間存在著邏輯上的主謂關係，並且 - ing形式表示賓語正在進行的動作。如：
He saw a girl getting on the tractor. ( = He saw a girl and the girl was getting on the tractor . )
Do you hear someone knocking at the door?
1).做賓語補足語We watched three boys sharing their food with each other.
2).做主語補足語She was heard singing in the next room.
3).做表語和定語My job is teaching English. /a walking stick/a waiting room
當-ing分詞做定語的時候，常常放在被修飾名詞的後面
The girl singing now is a classmate of mine.
4).做伴隨、原因、時間、結果狀語
He sat at the desk reading a magazine.
Being very young, he can't dress himself.
Having finished all the work, they went to the shore.
Her parents died, leaving her a big house.
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