I _______(begin)to learn the piano when I was right years old.

I _______(begin)to learn the piano when I was right years old.
I _______(begin)to learn the piano when I was right years old.

I _______(begin)to learn the piano when I was right years old.
你好,填过去式 began

I began to learn the piano when I was eight years old.
我八岁的时候开始学钢琴的.

为你解答。
I (began，开始，过去式) to learn the piano when I was eight years old.
句意：当我8岁时，我开始学弹钢琴。

填began
因为状语是“ I was right years old.（在我八岁时）”，是过去时间，所以谓语动词用其一般过去式。