受身形 => Passive voice N4
..は, ...が => Compare は and が N5
Compare
~V使役受身      => causative-passive form N4
Conjugate verbs
[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
は...が... => Something like that N5
Premise
は...が, は... => [A] but [B]; however; comparison N4
Compare
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
ことは~が => although; but ~ N3
ではあるが => Although it is N2
Evaluate
~には~の~がある      => has its own~ N3
Characteristic
が~なら~は~だ => If... is..., then... is... N3
Compare
… とはいいながら => although, even though... N2
Invariant