When giving this command to someone you're addressing formally/respectfully (usted), the verb ending is 'e' and the reflexive pronoun is 'se'; a third-person ending and a third-person reflexive pronoun are used because usted is a third-person subject pronoun. The 'e' verb ending is used for an AR- verb when conjugated in the third-person.
If the person being commanded is addressed familiarly (subject pronoun: tú), the second-person verb ending is 'a' and the second-person reflexive pronoun is 'te'.
Quedarse is a reflexive verb. When conjugated in the imperative mood, the reflexive pronoun is tacked onto the end of the verb and a tilde is added to the second-to-last syllable of the verb to maintain proper accentuation.
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