I've encountered this slight problem with an informal sentence:
Anyone know what a serrated knife is?
I thought the sentence was incorrect - there's no ·s for the third person singular. However, my teacher informed me that it might actually be correct, similarly as in the sentence "Everyone finished?".
I've been trying to find some explanation for this; however, I haven't really been successful.
[Does] anyone know
and[Is] everyone finished
show the formal grammar structure, but the first word is typically omitted in conversation.