playing computer games is very interesting 为什么用is

playing computer games is very interesting 为什么用is Playing computer games is very interesting. Playing computer games is very _____(excite) Lilei is playing computer games.(画线部分 playing computer games computer,playing,interesting,sounds,games(.) Jim is playing computer games.用every day改写句子 Playing computer games .后面的be动词用is还是are?为什么? I think playing computer games too much is bad for us为什么这里要用 The ( ) boy is playing computer games. Playing computer games is () than watching TV playing computer games is much_______（乐趣）. Playing computer games is great___.(fun)