是否

• Do you ever think about your childhood ?
  你是否回忆过你的童年？
• Do our successes mitigate our failures ?
  我们的成功是否能弥补我们的过失？
• I decided to test their story .
  我决定验证他们的说法是否属实。
• He hesitates about joining the expedition .
  他对于是否参加远征队犹豫不决。
• Are you going to let them in on the plans ?
  你是否打算让他们知道这些计划？
• Do you recognize a prefix or suffix ?
  你是否认得字首或字尾呢？
• Let's try on the plans for size .
  我们来讨论一下这些方案，看看是否行得通。
• The propriety of her deeds was doubtful .
  她的行为是否得体却是很可怀疑的。
• We should first prove his honesty .
  我们应该先考验他是否诚实。
• Do you inhale when you smoke ?
  你抽烟时是否把烟深深吸入肺部？