When should I use "tu" and when should I use "vous"?
The basic difference between the two is that "tu" is used for one person (i.e. in the singular) whereas "vous" is used for more than one person (i.e. in the plural). However, there are some instances where "vous" should be used for one person. It generally comes down to a question of politeness. For example, to a teacher or someone in a position of authority, you should ALWAYS use "vous". Generally speaking, "vous" should be used for anyone older than you, with the main exception being family, as they are typically very familiar to you. Hopefully that has cleared things up for you slightly. just remember: "tu" is FAMILIAR and "vous" is FORMAL.
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Translate into French: HI, my name is Claudia, I am sixteen years old and I am in year 11. I used to live in America with my Dad.
Vous êtes en vacances et vous envoyez une carte postale à votre ami. Dites où vous êtes, le temps qu’il fait, ce que vous avez fait et ce que vous avez l’intention de faire pendant le reste du séjour
Tu passes un bon moment en vacances et tu décides d’envoyer un e-mail à ton ami pour lui raconter. Écris l’e-mail que tu lui enverrais.