Dear mum!
Hi! How are you? I'm fine. This is a picture of me and my new friend I've met in school. My friend's name is ......., and he/she is ....years old. His/her favourite colour is orange. He/she has got a really nice dog as a pet. I'd like to have one too, if you don't mind.
See you soon!
Love,
............(numele tau)
