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