Bonjour
1- your best friend ► Salut first name or nickname !
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2- a woman to whom you are being introduced ► Bonjour Madame !
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3- Your uncle ► Bonjour name !
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4- your cousins Malia and Roger ► Salut Malia! Salut Roger ! Or Salut vous deux ! (hi both of you)
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5- Alex, a new student at school ► Bonjour Alex, bienvenue !
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6- Mademoiselle Aimée, who works at your favorite shopping mall ► Bonjour ! (it's usually not very polite to say "Bonjour Mademoiselle ! it depends how old she is and how well you know her. If you know her well enough, you'd say Bonjour Agnès !
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7- A teen you met on the subway yesterday ► Salut !
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hope this helps ☺☺☺