際に/際/際は => occasion, time N2
[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
[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
~きわまる/きわまりない(~極まる/極まりない)      => extremely; very ~ N1
に際して => on the occasion of; at the time of ~ N2
[極「きわ」]まる => Extremely A, could not be more A N1
Adjectival, Descriptions
[事「こと」]だ => A is necessary/good (offering advice/suggestion) N3
Needs, Requirement
事と次第によって => Depending on the progress of the situation N2
How to say the beginning
[事「こと」]ができる => Be able to A; can do A, Can A; be possible to A; N4
Causative, Passive, Volitional
に[限「かぎ」]った[事「こと」]ではない => It's not limited to A, it's not only A N1
Degree/ Level/Amount