The German language has a rule that makes asking questions a little bit different. Instead of just changing the intonation of your voice at the end of a sentence, you also have to move the verb to the beginning of the sentence. This means that instead of saying, "You are going to the store?" you would say, "Are you going to the store?"
In German, you would say "Gehst du zum Geschäft?" which means "Are you going to the store?" In this sentence, "gehst" (meaning "are you going") is the verb and it comes at the beginning of the sentence.
This rule might seem a little confusing at first, but it helps make sure that the person listening knows right away that you are asking a question. So if you're trying to speak German, don't forget to move that verb to the beginning!