当然だ/当たり前だ => natural; as a matter of course N2
可能形 => Potential form N4
[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
[可能系「かのうけい」] => Can, be able to, be possible to N4
Can, Should, Must
[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