[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
につけ~につけ => each time, whenever, either way N2
...かける => Impact N3
Act
だけ => only; just N5
…けれど => Explanation N3
Exclamatory
[事「こと」]ができる => Be able to A; can do A, Can A; be possible to A; N4
Causative, Passive, Volitional
わけても => Especially N1
Emphasize
... だけ ... => as much as N3
Base, base
けど => but; however; although ~ N5
だけ => as much as ~ N3
なければならない/なくてはならない/なければいけない/なくてはいけない/なければだめ/なくてはだめ => must N5