が必要 => need; necessary N4
必要がある => Need/Need to 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
[要「よう」]するに => A. In short/put simply, B N2
Adjectival, Descriptions
要するに => in short; in a word; to sum up; to put it simply ~ N2
[必要「ひつよう」]はない => It is not necessary for A to be done N2
Needs, Requirements
[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