Present, Future 快い is [x] 快くない is not [x] Past 快かった was [x] 快くなかった was not [x] Te-form, Continuative 快くて is [x] and... 快くなくて is not [x] and... Provisional 快ければ if it is [x] 快くなければ if it is not [x] Conditional 快かったら when/if it is [x] 快くなかったら when/if it is not [x] Adverbial 快く [x]-ly Noun form 快さ [x]-ness