以来 => since; henceforth ~ N2
~が故 => therefore; consequently​; because of; due to ~ N1
Cause, reason
[事「こと」]だ => A is necessary/good (offering advice/suggestion) N3
Needs, Requirement
て[以来「いらい」] => After A, B (continuous action/condition N2
Information, Report
事と次第によって => Depending on the progress of the situation N2
How to say the beginning
に行く/に来る/に帰る => go/arrive/go back (to do something) N5
[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
へ => Go to N, head to N , Often followed by verbs like 行く/いく, 来る/くる, 向かう/むかう… N5
Particles