伪造to pass off as

• 冒充内行

  pass off as an expert

• 冒充名牌

  pass off as a known brand

• 冒充好人

  pass off as a good person

• 拿假的冒充真的

  pass off fake as genuine

• 扣住了一个冒充商人的间谍

  caught a spy pretending to be a merchant