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