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