it is important for him to play the piano well中的不定式做什么成分

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it is important for him to play the piano well中的不定式做什么成分
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it is important for him to play the piano well中的不定式做什么成分
it is important for him to play the piano well中的不定式做什么成分

it is important for him to play the piano well中的不定式做什么成分
不定式做主语
It 是形式主语