"The man eats beef."
Translation:Mannen äter nötkött.
It depends on what vowel follows it. a, o, u, and å are "hard" vowels so k makes a hard k sound before them, but e, i, y, ä, ö are "soft" vowels so k usually sounds like ch/sh. There are some exceptions (like kille has a hard k), but that's a pretty good rule to follow.