play the piano为什么不加s Play the druns为什么加s?而Play the piano不加?
问题描述：
play the piano为什么不加s Play the druns为什么加s?而Play the piano不加?
答
play the piano 弹钢琴,钢琴通常是一架,单数不加s.
play the drums 打架子鼓,是一套鼓,好多个,所以加s.