Present, Future 究める, 究めます [does], will [do] 究めない, 究めません doesn't [do], will not [do] Past 究めた, 究めました [did] 究めなかった, 究めませんでした didn't [do] Te-form, Continuative 究めて, 究めまして 究めないで, 究めませんで 究めなくて Progressive 究めている, 究めています [doing], to be [doing] 究めていない, 究めていません not [doing] Volitional 究めよう, 究めましょう let's [do]!, I/we will [do], I/we intend to [do] 究めまい, 究めますまい I will not [do], I do not intend to [do] Imperative 究めろ, 究めよ, 究めなさい [do] ! 究めるな, 究めなさるな don't [do] ! Request 究めてください please [do] 究めないでください please don't [do] Provisional 究めれば if X [does], if X [is ~] 究めなければ if X doesn't [do], if X [is not ~] Conditional 究めたら, 究めましたら if X were to [do], when X [does] 究めなかったら, 究めませんでしたら if X weren't to [do], when X doesn't [do] Potential 究められる, 究められます be able to [do], can [do] 究められない, 究められません not be able to [do], can't [do] Passive, Respectful 究められる, 究められます is [done] (by ...), will be [done] (by ...) 究められない, 究められません isn't [done] (by ...), will not be [done] (by ...) Causative 究めさせる, 究めさせます makes/will make (someone) [do] 究めさせない, 究めさせません doesn't/won't make (someone) [do] Causative passive 究めさせられる, 究めさせられます is made/will be made to [do] (by someone) 究めさせられない, 究めさせられません isn't made/won't be made to [do] (by someone) ~たい form 究めたい want to [do] 究めたくない don't want to [do]