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My watch is nowhere to be found,I must have dropped it when

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My watch is nowhere to be found,I must have dropped it when I was on the bus
为什么是to be found
My watch is nowhere to be found,I must have dropped it when
由于watch是物,所以用被动语态,其结构为be+动词过去式,所以是is (to be found),
不定式作表语表示具体动作或将来动作;动名词作表语表示抽象的一般行为.
to be found表示强调“找”这个动作,being found表示一般行为,即一直都在找.其差别在于这里强调找不到这个动作