什么时候用play,什么时候用playing例句:Listen!The boy is ___(play) the piano in the music room.___处为什么要填playing

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什么时候用play,什么时候用playing例句:Listen!The boy is ___(play) the piano in the music room.___处为什么要填playing

什么时候用play,什么时候用playing例句:Listen!The boy is ___(play) the piano in the music room.___处为什么要填playing
什么时候用play,什么时候用playing
例句:Listen!The boy is ___(play) the piano in the music room.
___处为什么要填playing

什么时候用play,什么时候用playing例句:Listen!The boy is ___(play) the piano in the music room.___处为什么要填playing
你这个问题比较含糊,不够具体应该是.
play当谓语动词时,应根据时态和语态来决定用什么形式.如:play,played,played,plays等.
playing是非谓语动词形式.-ing形式在句中可以当主语、宾语或其它句子成份.
Playing football is one of my favorite outside class activities .
I like /enjoy playing football.