Present, Future 食べにくい is [x] 食べにくくない is not [x] Past 食べにくかった was [x] 食べにくくなかった was not [x] Te-form, Continuative 食べにくくて is [x] and... 食べにくくなくて is not [x] and... Provisional 食べにくければ if it is [x] 食べにくくなければ if it is not [x] Conditional 食べにくかったら when/if it is [x] 食べにくくなかったら when/if it is not [x] Adverbial 食べにくく [x]-ly Noun form 食べにくさ [x]-ness