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
なければ~た => If only it weren't... then... N4
Speculation
なければ ~ない => must do something; have to do something N4
Conditions (necessary conditions)
~と(も)なると/と(も)なれば => ~Just, whenever, once N1
Condition (hypothetical condition)
なければならない => Must do A; have to A N4
Can, Should, Must
も同然 => just like; same as ~ N2
けれども => but; however; although ~ N4
How to say the beginning
全然~ない => (not) at all N4
..... ばかりもいられない => can't keep doing ~ N2
Speculation
~ ば/たら~かもしれない => If only... then... N2
Regret
~ ば/たら~かもしれない => If...then maybe... N3
Condition (hypothetical condition)
…となれば => if that happens N2
Deduce