_Are_____you able to play the piano for us tomorrow?　为什么用Are

_Are_____you able to play the piano for us tomorrow?　为什么用Are Helen and Nancy are going to play the piano tomorrow You can ask Mike to play the piano for us. “I am able to play the piano”中用了be able to词组,to之后的动词为什么不用动名词 改被动语态 一句We asked Mary to play the piano for us. Can you s___ us how to play the piano? Who would like to play the piano. 这里为什么用 to play ,不可以用playin 用 together let play us piano the .连成一句话 let us ___ you __ the piano jack Ato watch , to play B to wa The teachers here are very friendly_(答案是to)us 为什么不可以用for? The children_____once______(teach)to play the piano. I often play the piano.如何用tomorrow来改写