How to distinguish the negative proposition with full quantifier from the negative proposition, please give an example

How to distinguish the negative proposition with full quantifier from the negative proposition, please give an example

The negation of propositions mainly aims at simple propositions (ordinary propositions) and propositions with quantifiers. At this time, the negation rule of the original propositions is: negating the conclusion and "Replacing" the quantifiers, that is, replacing the full quantifiers (existential quantifiers) in the original propositions with existential quantifiers (full quantifiers)

How to change the no proposition of full quantifier, existential quantifier, or, and, not, etc., the negation of proposition and the inverse proposition
Does the negative proposition of full quantifier and existential quantifier need not be changed? Is the converse proposition or negation of or to be and?

The former needs to change, while the latter seems to be