~ます/~ません => Polite, present form N5
Verb suffixes
[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
ことにする => Decide to N4
Causative, Passive, Volitional
かねない => Afraid that N2
Potential, Possibility
ね => Requests confirmation from the listener N5
Particles
ずにはすまない/ないではすまない => A must be done N1
Potential, Possibility
てもかまわない => No problem N4
Can, Should, Must
も[構「かま」]わず => Without considering A N2
Considering, Concerning
ござる/ございます => Have~ N4
Honorifics
させて[頂「いただ」]きます/させてもらいます => Allow me to A N1
Miscellaneous
ねばならない => Must A N2
Needs, Requirements
までだ/までのことだ => Only A (will be done) N1
(Not)only , (Not) even