He has learnt piano for two years改错

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He has learnt piano for two years改错
He has learnt piano for two years改错

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。