I have been playing computer since I was 5.这里为什么用was不应该有became吗?was应该不是瞬间动词啊

I have been playing piano for ten years.同义句I have been playing piano____ten years____ have been playing是什么意思 You look so tired .yes,I have been playing basketball I have been playing是主谓结构吗? I have been playing the piano since I _(be) 6 years old.填was,been,还是其他的什么? I have been playing with the dog.(提问）____ _____ you ______ _______? I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. --What was Wang Tao doing at that time?--Im sure he must have been playing the piano.为什么这里用must have been playing,不是完成进行时吗?说明现在还在做唠?----------------------------------------------------------------As we now ____ this photo,I am the tall boy and I'm_____the piano.I like playing it very ____.I have been p You look tired!Yes,I ----compurter games for two hours.选什么,为什么?You look tired!Yes,I ----compurter games for two hours.A,play.B,was playing.C,have been playing.D,am playing选什么,为什么? I do not love you,what would you I do not like you,but you have been playing,what would you I'm I have been there,have been 是have been in还是have been to的缩写?