ねばならない => Must A N2
Needs, Requirements
ぐらいのものだ => Only A N1
(Not)only , (Not) even
そばから => As soon as A, B N1
Time, Situation
からある,からの => Over A (stresses large amounts) N1
Degree/ Level/Amount
ものだから => Because of A N2
Reason, Result, Response
てばかりはいられない => Cannot always A N2
Needs, Requirements
といえば/というと/といったら => N3
Considering, Concerning
~ば => If~ N4
Conditional
から[見「み」]れば => If you think from the standpoint of A N2
Considering, Concerning
なければならない => Must do A; have to A N4
Can, Should, Must
ただ~のみならず => Not only A, N1
(Not)only , (Not) even
うものなら => If A, bad/unfortunate result B N1
Conditional, While