Чтобы образовать сравнительную и превосходную степень прилагательных, нужно учитывать их структуру.
* Hot: hotter, the hottest
* Short: shorter, the shortest
* Great: greater, the greatest
* Long: longer, the longest
* Clever: cleverer, the cleverest
* Thin: thinner, the thinnest
* Thick: thicker, the thickest
* Fat: fatter, the fattest
* Nice: nicer, the nicest
* Wide: wider, the widest
* Clean: cleaner, the cleanest
* Deep: deeper, the deepest
* Interesting: more interesting, the most interesting
* Beautiful: more beautiful, the most beautiful
* Comfortable: more comfortable, the most comfortable
* Delicious: more delicious, the most delicious