たとたん => As soon as A (occured), B N3
Time, Situation
[謙譲語「けんじょうご」] => Humble form of A, humble form of する verbs N4
Honorifics
[尊敬語「そんけいご」] => Respectful form of A N4
Honorifics
~ました/~ませんでした => Polite, past form of verb N5
Verb suffixes
に[反「はん」]して/に[反「はん」]し/に[反「はん」]する/に[反「はん」]した => In contrast to A N2
Contrast,Surprise
て[頂「いただ」]けないでしょうか? => Could you please A for me? N4
Secondary Verb
んがため => For the purpose of doing A N1
Reason, Result, Response
ところだった => About to… N3
Will, Decision, Doing
[受「う」]け[身「み」] => Passive, be V-ed. N4
Causative, Passive, Volitional
と([思「おも」]う、[言「い」]う、[考「かんが」]える) => That A N4
Particles
てとうぜんだ => A is common, natural, not surprising N2
Adjectival, Descriptions
に[答「こた」]えて => In response to A N2
Reason, Result, Response