Ответ:

old - older - the oldest

young - younger - the youngest

high - higher - the highest

low - lower - the lowest

happy - happier - the happiest

sad - sadder - the saddest

cold - colder - the coldest

hot - hotter - the hottest

tall - taller - the tallest

short - shorter - the shortest

fast - faster - the fastest

slow - slower - the slowest

existing - more exciting - the most exciting

boring - more boring - the most boring

popular - more popular - the most popular

difficult - more difficult - the most difficult

enjoyable - more enjoyable - the most enjoyable

dangerous - more dangerous - the most dangerous

beautiful - more beautiful - the most beautiful

interesting

comfortable - more comfortable - the most comfortable

bad - worse - the worst

little - less - the least

many - more - the most

far - farther - the fаrthest