Образовать сравнительную и превосходную степени: hard, large, easy, slow, difficult, interesting, useful, effective

Объяснение:

Сравнительная: harder, larger, easier. slower, more difficult, more interesting, more useful, more effective

Превосходная: the hardest, the largest, the easiest, the slowest, the most difficult, the most interesting, the most useful, the most effective