動(dòng)詞-ing形式作表語、定語和賓語補(bǔ)足語的用法

　　Our job is playing all kinds of music . ( 動(dòng)名詞 )

　　The music they are playing sounds so exciting . ( 現(xiàn)在分詞 )

　　注：一般來講，動(dòng)名詞 ( 短語 ) 作表語，主表可互換，即：Playing all kinds of music is our job.

　　現(xiàn)在分詞作表語，表明主語的性質(zhì)和特征，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(jìn)行的動(dòng)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(dòng)詞后可以用 - ing形式做賓語補(bǔ)足語。這時(shí) - ing形式和句子的賓語之間存在著邏輯上的主謂關(guān)系，并且 - ing形式表示賓語正在進(jìn)行的動(dòng)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(bǔ)足語We watched three boys sharing their food with each other.

　　2).做主語補(bǔ)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(dāng)-ing分詞做定語的時(shí)候，常常放在被修飾名詞的后面

　　The girl singing now is a classmate of mine.

　　4).做伴隨、原因、時(shí)間、結(jié)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.