Under construction!
ADVERBS
Adverbs are made out of the adjectives' stems (the part of an adjective that lefts after cutting out the -y/-i ending of the basic form of an adjective) by adding one of the two suffixes: -'e/-je or -o. The -o suffix is used with soft stem adjectives and those ones, whose stems end with h ch k. The -'e/-je one is used with all others adjectives. Sometimes one adjective may take both suffixes and have two wariants of corresponding adverbs, ex.:
zymny - zymnje / zymno
suchy - sucho / suše
wuski - wusko / wusce
[here you have explained, how does the -'e suffix effect the preceding consonant]
The comparative is made by changing the -'e/-je and -o suffixes into -(i)šo, ex.:
zymno / zymnje - zymnišo
sucho / suše - suchšo
Adding the naj- prefix to the form of the comparative makes the superlative. This prefix never carries a word stress, so the stress in the superlative forms falls on the second syllable of a word.
zymnišo - najzymnišo
suchšo - najsuchšo