てこそ => Now since A... N2
Reason, Result, Response
に[即「そく」]して => In accordance with A, Keeping A in mind, In keeping with A N1
Based/focused/depending on
に[沿「そ」]って/に[沿「そ」]い/に[沿「そ」]う/に[沿「そ」]った => Along with A; In line with A N2
Based, Focused, Depending on
てしまう => Did something N4
Secondary Verb
くせして => Even though A N2
Contrast,Surprise
[際「さい」]して/に([際「さい」]し)/に[際「さい」]しての => At the time of A (which starts now).. N2
Time, Situation
それはそうと => By the way N2
Miscellaneous
てさしあげる => Do for N4
Give and take advice
てしょうがない/てしかたがない => Very A; Really A; Extremely A N2
Degree, Level, Amount
もし~としても => Even if A... (chances of A are pretty low) N3
Not only, Not even
したがって => Because of A, B N2
Reason, Result, Response
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing