I learned ____(play) the violin when i was eight years old .这里的PLAY为什么不变成PLAYED而变成TO PLAY呢

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I learned ____(play) the violin when i was eight years old .
这里的PLAY为什么不变成PLAYED而变成TO PLAY呢

to play
to play 是不定式,有名词性质,所以可以做learn 的宾语,而played 则没有,不可以作宾语