问题描述：
不定式在句子中充当什么成分?
如My brother rides his bicycle to work. 句子中to work为不定式短语,在句子中充当什么成分呢? to在这里是介词吗?
如My brother rides his bicycle to work. 句子中to work为不定式短语,在句子中充当什么成分呢? to在这里是介词吗?
问题解答：
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