Happy - happier - happiest
young - younger - youngest
shallow - shallower - shallowest
difficult - more difficult - most difficult
dirty - dirtier - dirtiest
patient - more patient - most patient
hot - hotter - hottest
comfortable - more comfortable - most comfortable
brave - braver - bravest
wise - wiser - wisest
friendly - friendlier - friendliest // friendly - more friendly - most friendly (и так, и так допускается)
ridiculous - more ridiculous - most ridiculous
late - later - latest
little - less - least