First message

Hello, I'm Christine. I'm French and I would like to improve my English. I started learning fifteen years ago, but I haven´t practiced for 10 ten years. I am not sure of the words I should use (or "I am not sure which words I should use"), and I write in english as I would do in French. How can I say that I am learning English "again"?
Could you correct my message?
Thank you
Have a good day!

There are many ways to say "I am learning English again." This is correct. Another way is "I started learning English again."

Good luck.

First message

Hello, I'm Christine. I'm French and I would like to improve my english. I started learning fifteen years ago, but I haven´t practice practised for 10 years. I am not sure of the words i use, My vocabulary isn't very good and i write in english as i would do in French and I use french phrasing rather than english phrasing. How can do I say that I am learning english "again"?
Could you correct my message?
Thank you
Have a good day!

Hi Christine! That's exactly how you say it: "I am learning english again" ! :) The amount of words you know in a language is your "vocabulary" and "phrasing" referrs to the order of the words in a sentence, which changes from language to language. I'm sorry if you already know this, but I didn't want to give you words in your correction that you might not understand :)

Let me know if you have any questions, and best of luck with your studies! :)