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