~のは…ぐらいのものだ => only (emphasis) N1
Limit
~と(が)相まって => combining / together with… N1
Attached
たものではない => Impossible N2
Evaluate
に相違ない => without a doubt; certain; sure N2
…のも無理 (は) ない => It's natural for... N3
Evaluate
とはいうものの => having said that; be that as it may N2
Things do not match the prediction
というものは...だ => something like; something called ~ N3
Explain
... ないものは ...ない => is not entirely impossible N3
Ability
に[相違「そうい」]ない => No doubt N2
Information, Report
と[相「あい」]まって => Along with A N1
Lists, examples
のでは => if N3
Condition (hypothetical condition)
ものの => but, although N2