重点讲解：
1. what if
（用于疑问句句首，尤用于询问不希望看到的事发生时的结果）如果…怎么办
eg. What if this doesn't work out?
如果这个不行怎么办？
eg. What if he was going to die!
如果他快要死了该怎么办？
eg. What if relations between you and your neighbour have reached deadlock, and their behaviour is still unacceptable?
如果你和你的邻居已闹僵了，而他们的行为还是令人难以接受，那怎么办？
2. in that case
那样的话；在那种情况下，意同in which case；
eg. In that case you'll have to clear yourself.
那样，你只得自行辩白了。
hat case it may interest you to know that Miss Woods witnessed it.
你也许对这起袭击还有些怀疑。那么如果我告诉你伍兹小姐亲眼目睹了这起事件，你可能会感兴趣。
Members are concerned that a merger might mean higher costs, in which case they would oppose it.
成员们担心合并会导致成本提高，若是那样的话，他们将提出反对。