Such as: "Don't" "Can't" "Won't"
Yes, all the time. The negative particle was "ne", which went before verbs. It contracted with auxiliary type verbs that began with a vowel, "w", or "h". So "he ne will" (he will not) becomes "he nill"; "ic ne eom" (I am not) becomes "ic neom"; "ic ne hæbbe" (I do not have) becomes "ic næbbe", and so on.