Sweet - sweeter, sweetest
Pleasant - more pleasant, most pleasant
Sunny - sunnier, sunniest
Narrow - narrower, narrowest
Long - longer, longest
Comfortable - more comfortable, most comfortable
Interesting - more interesting, most interesting
Young - younger, youngest
Favorite - more favorite, most favorite
Wonderful - more wonderful, most wonderful
Hot - hotter, hottest
Frosty - frostier, frostiest