Sale! 50% off! Now 8. 99zl down from 17. 99zl! Do you say. "How to say? ", "I speak English language", "the whole Poland" or "I'll be in 5 minutes"? Well, these are all wrong! This app, the first of its kind for Poles, explains why! Do you know the difference between "people/persons", "at/in/on the market"? Or "to be at/in work"? If not, then YOU NEED THIS APP!