He has learnt piano for two years改错

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He has learnt piano for two years改错

He has been learning the piano for two years.

the piano
乐器前面要加冠词 the

为你解答。
He has learnt(改为practised) the piano for two years.
他已经练了三年钢琴了。
解释:这里需要一个延续性的动词做谓语。
learn是学会的意思,不适合用于延续的动作。