使役形 => Causative form N4
~V使役受身      => causative-passive form N4
Conjugate verbs
[使「し」][役「えき」] => Coercive, permission, allow, make N4
Causative, Passive, Volitional
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
~のは…ぐらいのものだ => only (emphasis) N1
Limit
いつかの ... => Previously N4
Time
くらいの => Approximate~ N3
Emphasis on degree
…の…ないの => thinking whether or not to do something... N2
Position, perspective
というのは => because N2
…からいいようなものの => It’s a good thing that… this time… N1
Criticize
... というのは => It means... N3
Explain
どのくらい => how long N5