んです => Because, by… N4
Situations and Experiences
でなくてなんだろう => It's definitely A (and not something else) N1
Information, Report
そこで => Considering the situation A, B N2
Considering, Concerning
それでも => Even though A, B N2
Contrast,Surprise
[尊敬語「そんけいご」] => Respectful form of A N4
Honorifics
そうにない => N2
Potential, Possibility
いかんでは,いかんによっては => Considering A, depending on A N1
Based/focused/depending on
もなんともない => Not A at all N1
Adjectival, Descriptions
~ました/~ませんでした => Polite, past form of verb N5
Verb suffixes
ないものでもない/ないでもない => A is not completely impossible N1
Need/Requirements
に[相違「そうい」]ない => No doubt N2
Information, Report
ばそれまでだ => If A happens, it's over (nothing will be of use) N1
Conditional, While