I find it hard to us的it后为什么可省略is

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 Find 的特殊用法:
  Find 后可用分词做宾补,或先加形式宾语,再加形容词,最后加带to 的动词不定式。find后也可带一个从句。此类动词还有get,have。
  I found him lying on the ground.
  I found it important to learn.
  I found that to learn English is important.
  典型例题:
  The next morning she found the man ___ in bed,dead.
  A. lying  B. lie  C. lay  D. laying
  答案:A.find的宾语后面,用分词或分词短语,起宾语补足语作用。现在分词表达主动,也表达正在进行,过去分词表达被动。
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