What if you should fall sick?

如果你生病了怎么办？

In fact, they seldom fall sick now.

其实，他们现在也很少生病了。

I would have a burden if you fall sick of me.

如果你们因为我而生病，我会有负担的。

He fall sick with malaria on a trip to Africa.

他在去非洲时患了疟疾。

Why did some people fall sick, when others did not?

他从医不是为了一个目标，也是缘于一个问题——即，为什么有些人生病，其它人不生病？