Sometimes a noun and a verb are very similar, and they can be confusing. The word breath is a noun. We take a breath when we take air into our lungs. The word breathe is a verb. When we take air into our lungs, we breathe.
Use breath as a noun. Use breathe as a verb.
It’s your turn. Decide if you should use breath or breathe in this sentence blank: It is hard to _____ when the air is very humid. Did you figure out that you must use the verb? Good for you!