The correct conjugation of the verb "être" in Present Tense, to fill the sentence is:
Translation.
Present Tense in French.
The conjugation of the verb "être" in present tense, taking into account the personal pronouns is:
Since the form "Ton cousin et toi," which corresponds to the noun of the sentence, can be replaced by the personal pronoun "vous," the correct conjugation of the verb is "êtes."
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