To write a presentation of a couple from the USA, and one from Brazil, you should use phrases that characterize you and allow other people to know more about you.
It is essential that the student prepares himself before the presentation, identifying himself by name, nationality, his professional plans and preferences for example, so that individuals understand more about you, generating identification and greater social integration.
So for a student coming from Brazil for example, your presentation could be based on your goals and talk briefly about your country and culture.
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