Activities for Sergio, Matías and their class:
You are planning a lesson about the city and the country. Here are some links with games to help you. I hope you'll enjoy:
http://www.bbc.co.uk/scotland/education/wwww/buildings/standard/game1/
http://www.bbc.co.uk/scotland/education/wwww/buildings/standard/game2/index.shtml
http://learnenglishkids.britishcouncil.org/en/language-games/monkey-squash/places-town