[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
[切「き」]れない => Can't finish/complete A N3
Potential, Possibility
ことはない => Not necessary N3
Needs, Requirement
っこない => A is definitely not possible N2
Potential, Possibility
ことになる => To decide that A N4
Causative, Passive, Volitional
ことなく => Without doing A once (expressed strongly) N2
Will, Decision, “Doing”
どころではない => Its not A N2
Contrast,Surprise
ことなしには => Without doing A, B N1
Conditional, While
[事「こと」]ができる => Be able to A; can do A, Can A; be possible to A; N4
Causative, Passive, Volitional
べきだ/べきではない => Should do A; Must do A, Should not do A; Must not do A N3
Needs, Requirement
に[越「こ」]したことはない => It's better if A, it's better if it's A N1
Comparison/ Exchange
ことになっている => Plan, rule, decide N2
Information, Report