是否

• Used there to be swallows here ?
  这里是否一向都有燕子？
• I doubt if he understands the aim of our being .
  我怀疑他是否了解我们生存的目的。
• Are they metabolized to more toxic compounds .
  它们是否被代谢成毒性更强的化合物？
• His suitability for the post is open to question .
  对这一职位他是否适宜很成问题。
• Do you reject alice cooper as sick ?
  你是否讨厌阿里斯库柏，是否也认为他是病态？
• Their acceptance of the contract is still in doubt .
  他们是否接受那合同还说不准。
• Don't you know anyone who could throw his weight around ?
  你是否认识有影响的人物？
• I wondered if you needed a spare pair of sheets .
  我想问问你是否需要两条备用床单。
• He has a question of the sufficiency of the equipment .
  他对设备是否够用表示怀疑。