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