请问是playing piano 还是playing violin呢?

是playing a piano 还是playing piano 请问是playing piano 还是playing violin呢? 英语play the...playing的用法是playing piano 还是 play the piano?play the piano,playing piano,playing the piano的用法?（当然了 我不知道这三个词组哪个错了,所以全部发生来了） 弹钢琴是我的爱好Playing the piano is my hobby还是playing piano is my hobby （he enjoys playing the piano now)还是（he is enjoying the piano now)he enjoys playing the piano now)还是（he is enjoying playing the piano now) 不好意思啊~是这样！ 整个句子是：Emily was already singing and playing piano by age two.请问by age CAN YOU PLAYING PIANO?用playing对吗语法问题用playing还是play? Miss Chen is playing the piano.(对 piaying the piano 进行提问答案是what does Miss Chen doing?还是what is Miss Chen doing He is a talented piano player.同义句转换,He has _______ _________ _______ the piano.是填talents for playing 还是a talent for? Yesterday evening I was playing the piano when the doorbell rang这里when是从属连词还是并列连词,原因 How long have you been playing the piano?_______是填Since five years ago还是for five years 英文简历 特长 踢足球 playing 还是play简历中对特长用表格进行罗列的时候（不是句子）,踢足球是playing football 还是 play football? 弹钢琴是playing piano 还是 play I can playing piano when mother came in,Mary was playing the piano请问可以改为when mother came in,Mary was playing thewhen mother came in,Mary was playing the piano请问可以改为when Mary was playing the piano,mother came 请问playing the pipa的琵琶是大写还是小写? I practice playing the piano every day.（对划线部分提问）playing the piano 是划线部分、、、急求答 请问是They are all playing football还是they all playing football 是do sth.well 还是doing sth.well在这个句子中：是He finds he can play the piano well.还是He finds he can playing the piano well.