Non credo che c'entri

[cloclo15]

Translates as:

I don't believe that it can enter.

Please can someone explain why it doesn't translate as:

I don't believe that you enter there

[Viaggiatore]

"Entrarci" means "be relevant." So the sentence means something like "I don't believe that it enters into it" or "I don't think that's relevant." http://www.wordreference.com/iten/entrarci

[cloclo15]

But the verb enter had just been introduced and entri is the secon person singular present, I think?

[Viaggiatore]

Actually it's third person. It's subjunctive: http://italian.about.com/library/verb/blverb_entrare.htm Used in a subordinate clause after Non credo.