cold - colder the coldest
small - smaller - the smallest
soft - softer - the softest
big - begger - the biggest
sad - sadder - the saddest
early - earlier - the earliest
young - younger - the youngest
clean - cleaner - the cleanest
cold colder coldest
small smaller smallest
soft softer softest
big bigger biggest
sad sadder the saddest
early earlier earliest
young younger youngest
clean cleaner cleanest
https://englishmore.ru/verbs/formy-glagola-clean
вот держи на всякий случай сайт
