Present, Future わかりやすい is [x] わかりやすくない is not [x] Past わかりやすかった was [x] わかりやすくなかった was not [x] Te-form, Continuative わかりやすくて is [x] and... わかりやすくなくて is not [x] and... Provisional わかりやすければ if it is [x] わかりやすくなければ if it is not [x] Conditional わかりやすかったら when/if it is [x] わかりやすくなかったら when/if it is not [x] Adverbial わかりやすく [x]-ly Noun form わかりやすさ [x]-ness