As far as language goes, some see similarities in the words in Peter and Mark. Mark actually was the interpreter for Peter. Mark has the simplest vocabulary of the gospels.
Kwa upande wa lugha, wako watu wanaoona kufanana kwa maneno kwenye Waraka wa Petro na Injili ya Marko. Marko alikuwa mkalimali wa Petro. Marko ina misamiati myepesi kuliko Injili zote.