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