Подчеркните прилагательные в предложениях и укажите степень сравнения. 1. broken stone is the most suitable material for ballast. 2. travelling in an open-type coach is cheaper than in a sleeping car because sleeping cars are more convenient. 3. in the grand prix motor racing just a few seconds sometimes separate the fastest car from the slowest car in the race
2. cheaper, more convenient - сравнительная степень
3, fastest, slowest - превосходная степень