It is not verb “être”. Then why are you using un and not de in the example “il rester un ami loyal” and “il ne reste pas un ami loyal”
Why not “il ne reste pas d’ami loyal
The note in the lesson says:
"This rule does NOT apply to sentences using the verb être and other Verbes d'état, with which the indefinite article doesn't change."
Note that the rule clearly specifies verbes d'état, of which rester is one. So the exception also applies to rester.
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