[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
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
~しいしい => Every once in a while... (Repeat situation) N1
Repetition, habit
[事「こと」]ができる => Be able to A; can do A, Can A; be possible to A; N4
Causative, Passive, Volitional
らしい => It looks like N3
Situation
いたします => to do (polite form of します) N4
てもよろしいでしょうか => May I... N4
Allow
いつしか => before one knows N2
Accept, agree
しか~ない => only; nothing but N4
だけしか~ない => only N3
たいして…ない => ~is not much of~ N3
Emphasis on degree