Present, Future かさ高い is [x] かさ高くない is not [x] Past かさ高かった was [x] かさ高くなかった was not [x] Te-form, Continuative かさ高くて is [x] and... かさ高くなくて is not [x] and... Provisional かさ高ければ if it is [x] かさ高くなければ if it is not [x] Conditional かさ高かったら when/if it is [x] かさ高くなかったら when/if it is not [x] Adverbial かさ高く [x]-ly Noun form かさ高さ [x]-ness