なくて済む/ないで済む => get by without doing ~ N2
ずに済む => get by without doing ~ N2
て済む => sufficient by; no problem to; resolve by ~ N3
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
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