Contractions

noun a word used to identify any of a class of people, places, or things

verb a word used to describe an action, state, or occurrence

adverb a word or phrase that modifies or qualifies an adjective, verb, or other adverb

preposition a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause

conjunction a word used to connect clauses or sentences or to coordinate words in the same clause

article a word that is used with a noun to specify grammatical definiteness of the noun, and in some languages extending to volume or numerical scope

• I wouldn’t have been able to attend the meeting if I hadn’t received the reminder.
• I wouldn’t’ve made it to the party without your help.
• I wouldn’t’ve been caught dead wearing that outfit.
• She wouldn’t’ve jumped to conclusions if she had all the facts.

verb a word used to describe an action, state, or occurrence; in this case, 'shouldn’t’ve' is a contraction of 'should not have'

adverb a word or phrase that modifies or qualifies an adjective, verb, or other adverb; in this case, 'shouldn’t’ve' functions as an adverbial contraction

pronoun a word that can function by itself as a noun phrase and that refers either to the participants in the discourse or to someone or something mentioned elsewhere in the discourse; in this case, 'shouldn’t’ve' does not function as a pronoun

• One shouldn’t’ve interrupted the speaker during the presentation.
• You shouldn’t’ve eaten all the cake before the party.
• She shouldn’t’ve ditched her friends to hang out with him.
• The company shouldn’t’ve put all their eggs in one basket when it came to investments.