~助詞+数量      => Corresponds to the verb...of quantity N5
Quantity
決して~ない => never; by no means ~ N3
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
に決まっている => certainly; I’m sure/certain that; it must be the case that ~ N2
に[決「き」]まっている => A is a given, A must be the case N2
Information, Report