Dear Alex,(имя можешь поменять)
Hi! I haven't heard from you for ages! How are you? I was very happy when I got your letter.
Well, you asked how I had passed my weekend. I didn't have much homework to do, so when my friends called me, I was ready to walk with them. We were at cinema, then we went to the cafe (cafe е со значком). We did lots of shopping that day. I think we spent great time!
Oh, well, better go now. Now we've got too much homework, unfortunately!
Write back soon!
Your friend/Lots of love
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