一定是

• He thought he was upon an enchanted island .
  他认为自己一定是来到一个仙岛上了。
• Someone must have juggled things .
  一定是有人从中弄手脚。
• "this must be some falsehood!" cried the notary .
  “这一定是捏造！”公证人说。
• I said he must have lost his way .
  我说他一定是迷了路了。
• Jan must be a good player .
  简一定是一个优秀足球运动员。
• I thought it would be fearfully quiet .
  我起先还以为它一定是个死气沉沉的地方哩。
• He must have spotted the trap .
  他一定是识破了这个圈套。
• Astounding! it must be a mistake .
  奇怪！一定是搞错啦。
• They must follow from the basic principles .
  它们就一定是自基本原理推导得出来的。
• It must be a lovely feeling .
  那一定是一种有趣的感觉。