It's sometimes possible that Sally really ought to know what Billy said to Jane, if Billy were engaged in some morally culpable deception.

假如比利正牵扯着一桩道德上应受谴责的欺骗，此时萨利需要了解比利和简的谈话就是合理的。

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M: Jane and Sally are friends.

男：简和萨莉是朋友。

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Sally: But Jane, you knew he's writing a big essay that's due tomorrow.

莎莉：可是阿珍，你也知道他正在赶一篇明天要交的重要论文吧。

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