[必要「ひつよう」]はない => It is not necessary for A to be done N2
Needs, Requirements
ねばならない => Must A N2
Needs, Requirements
なければならない => Must do A; have to A N4
Can, Should, Must
てばかりはいられない => Cannot always A N2
Needs, Requirements
そばから => As soon as A, B N1
Time, Situation
[要「よう」]するに => A. In short/put simply, B N2
Adjectival, Descriptions
といえば/というと/といったら => N3
Considering, Concerning
なら => If N4
Conditional
も~ば~も/も~なら~も => A is B and C is D; neither A is B nor C is D N2
Lists, Examples
~ば => If~ N4
Conditional
から[見「み」]れば => If you think from the standpoint of A N2
Considering, Concerning
ともなると,ともなれば => When (the time/situation) A N1
Time, Situation