[合「あ」]う => To do A together/mutually N4
Secondary Verb
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
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
なくてはいけない => Must do A; have to A N4
Can, Should, Must
[尊敬語「そんけいご」] => Respectful form of A N4
Honorifics
を[契機「けいき」] => As a good opportunity A, (do) B N2
Information, Report
なければならない => Must do A; have to A N4
Can, Should, Must
て[頂「いただ」]けないでしょうか? => Could you please A for me? N4
Secondary Verb
かけの/かけだ => B in the middle of A; half-A B N3
Time, Situation
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