You. Me. We used to be on fire.

你。我，因我们过去经常着火！

Indeed, your mind will be on fire!

实际上，你的思想会燃烧起来！

In that case, the whole house would be on fire.

如果那样的话，整个房子就会着火。

"Child:" Mommy, how come my hair would be on fire?

孩子：“妈妈，我的头发怎么会着火呢？”

Look at that smoke. That building must be on fire.

看那股烟，那座大楼肯定着火了。