Do you sometimes say that you have your friends when you mean you're with them, and that you're with a hostage when you mean you have him? Clarify your understanding of "með" so the cops can understand you more clearly!
The difference between riding your bike to school and riding it around the halls at school is one small case difference. Learn the difference between the accusative and dative with these prepositions!
Dictionary shorthand: the original text speak? No, obviously not, but still important to learn!
If I had a króna for every time I'm asked about how cases work I wouldn't need a day job. Learn the basics of this popular topic now!