Present, Future 足がすくむ, 足がすくみます [does], will [do] 足がすくまない, 足がすくみません doesn't [do], will not [do] Past 足がすくんだ, 足がすくみました [did] 足がすくまなかった, 足がすくみませんでした didn't [do] Te-form, Continuative 足がすくんで, 足がすくみまして 足がすくまないで, 足がすくみませんで 足がすくまなくて Progressive 足がすくんでいる, 足がすくんでいます [doing], to be [doing] 足がすくんでいない, 足がすくんでいません not [doing] Volitional 足がすくもう, 足がすくみましょう let's [do]!, I/we will [do], I/we intend to [do] 足がすくむまい, 足がすくみますまい I will not [do], I do not intend to [do] Imperative 足がすくめ, 足がすくみなさい [do] ! 足がすくむな, 足がすくみなさるな don't [do] ! Request 足がすくんでください please [do] 足がすくまないでください please don't [do] Provisional 足がすくめば if X [does], if X [is ~] 足がすくまなければ if X doesn't [do], if X [is not ~] Conditional 足がすくんだら, 足がすくみましたら if X were to [do], when X [does] 足がすくまなかったら, 足がすくみませんでしたら if X weren't to [do], when X doesn't [do] Potential 足がすくめる, 足がすくめます be able to [do], can [do] 足がすくめない, 足がすくめません not be able to [do], can't [do] Passive, Respectful 足がすくまれる, 足がすくまれます is [done] (by ...), will be [done] (by ...) 足がすくまれない, 足がすくまれません isn't [done] (by ...), will not be [done] (by ...) Causative 足がすくませる, 足がすくませます makes/will make (someone) [do] 足がすくませない, 足がすくませません doesn't/won't make (someone) [do] Causative passive 足がすくませられる, 足がすくませられます is made/will be made to [do] (by someone) 足がすくませられない, 足がすくませられません isn't made/won't be made to [do] (by someone)