In predicate logic can we have valid arguments if we make an existential claim

In predicate logic can we have valid arguments if we make an existential claim

In predicate logic can we have valid arguments if we make an existential claim in our premises and not in the conclusion? In other words can we simply rename the existential quantifer to a "particular" quantifer or something of the sort? Does this particular quantifer always have to carry existential import?

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