Verb conjugation of "retomber" in French

In order to improve the language skills we changed some features on Vocabulix. From now on users can not only drill isolated lesson but adhere to a specific lesson plan. That means that they can set goals and seek help from other users.
We can help each other with these language studies, this is also the main purpose of Vocabulix. I have already got in touch with some other users. I can speak Italian, but my grammar is weak.
If you have long text messages - please write me a letter. Then the correction is easier for me. I think it's difficult to get accommodation in town. I have many friends in Madrid.