なくてはいけない => Must do A; have to A N4
Can, Should, Must
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
なければならない => Must do A; have to A N4
Can, Should, Must
てはいけない => May not A, must not A N4
Can, Should, Must
わけにはいかない => Must not A, Must A N3
Needs, Requirement
へ => Go to N, head to N , Often followed by verbs like 行く/いく, 来る/くる, 向かう/むかう… N5
Particles
だけではすまない => Doing A is not going to suffice N1
Miscellaneous
わけがない => There's no reason for A (A should not be possible) N3
Potential, Possibility
て[頂「いただ」]けないでしょうか? => Could you please A for me? N4
Secondary Verb
わけではない => Although you may think A, that is not the case. N3
Contrast
ないものでもない/ないでもない => A is not completely impossible N1
Need/Requirements
[尊敬語「そんけいご」] => Respectful form of A N4
Honorifics