In the world of language teaching, the communicative approach is very popular. However, most often students simply act out dialogues based on ‘real-life situations’, and, to be honest, it comes out rather unnatural. My group of students went further – towards the so-called "case study" and together we helped our acquaintance, a young entrepreneur, create an English advertisement for his mobile app, which helps gardeners share their abundant crops with neighbours. We designed the ads, filmed and edited them ourselves. For me, it is very important to teach students practical skills of language use letting them have a lot of ‘field practice’.