[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
わけがない => There's no reason for A (A should not be possible) N3
Potential, Possibility
~がほしい => I want ~ N5
Asking and Telling
うと~まいと,うが~まいが => Whether or not A (is/occurs) N1
Based/focused/depending on
てはいけない => May not A, must not A N4
Can, Should, Must
に[違「ちが」]いない => Without a doubt, A N2
Information, Report
がっている => Want, like N4
Secondary Verb
わけにはいかない => Must not A, Must A N3
Needs, Requirement
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
なくてはいけない => Must do A; have to A N4
Can, Should, Must
がっている => Wants to A N3
Will, Decision, Doing