受身形 => Passive voice N4
[後「あと」]で => After V1, V2 N5
Time
~V使役受身      => causative-passive form N4
Conjugate verbs
〜がさいご(が最後) => if you do... negative result N1
Decisive (resolute decision)
[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
たが[最後「さいご」] => Once A occurs, B happens N1
Information, Report
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional