Here you are asking a question about 'in the event of' or 'in the event that.' Usually you are looking for an answer at the time of the question that is being asked.

在这里，你是问关于'in the event of'或者'in the event that'的问题，通常你会在被问到问题的时候寻找答案。

Here are some examples: 这里有一些例子： 

"What if I miss the bus?"

 如果我错过了公交车怎么办？

"What if I were late to dinner?"

 如果我晚餐迟到了怎么办？

"What if I called her tomorrow?"

 如果我明天打电话给她会怎么样？

"What if I don't understand?"

 如果我不理解会怎么样？

"What if someone sees me?"

 如果有人看到我怎么办？

"What if no one is home?"

 如果没人在家会怎么样？

"What if they decide to stay?"

 如果他们决定留下来会怎么样？

"What if it rains while we are camping?"

 如果在我们露营的时候下雨了怎么办？

"What if I do not finish on time?"

 如果我没能按时完成会怎么样？

"What if we introduce ourselves first?"

 如果先介绍我们自己会怎么样？