When we're sleeping, she breathes on me.

睡觉时她对着我呼吸喘气。

I think you have chicken pox! You are contagious! Get away! Don't breathe on me!

我觉得你可能长水痘了！会传染的！快走开！不要对着我呼吸！

I could feel him breathing on me.

我都能感觉到他的呼吸。

It might have breathed on me.

我都能感受到他的呼吸。