Puncture wounds are most likely to fester. Has last week's laceration begun to fester for you?
I fester in this class while the other kids are allowed outside to play.
Water left to Stagnate will soon fester and smell
My bloody cut would not stop festering.
A sentence is a sentence because it has a subject (noun or noun phrase), a predicate ( verb) and punctuation as well as the other parts of speech like pronouns ( she, it him, her, they, them)...
Types of English Sentences
Everyday English Idiom - On the Other Hand
How to Say "May I ask, Can you speak English?" in Mandarin
How to Say "Where is the bathroom" in Mandarin