Breakdown of Wir kennen euch nicht.
wir
we
nicht
not
kennen
to know (somebody/something)
euch
you (plural, informal)
Questions & Answers about Wir kennen euch nicht.
Why is "you" translated as euch here?
euch is the direct object (accusative) form of ihr. You use ihr when talking informally to more than one person (like "you guys" or "y'all"). Because the people being known are receiving the action of the verb kennen, we must use the accusative form euch.
Why does this sentence use kennen instead of wissen for "to know"?
German has two common verbs for "to know." You use kennen when you are familiar with a person, place, or thing. You use wissen when you know a fact or piece of information. Since this sentence is about knowing people (euch), we have to use kennen.
Why does nicht go at the very end of the sentence?
In German, when you want to negate the entire action of a sentence, the word nicht (not) usually gets pushed to the very end. This is especially true when the verb has a pronoun as a direct object (like euch). It is literally structured as "We know you not."
How would I say "We do not know him" instead?
You would swap out euch for the accusative pronoun for "him", which is ihn. The sentence would become: Wir kennen ihn nicht.