I speak Luxembourgish fluently, but as you never learn a lot of Luxembourgish Grammar, only few write it correctly.
I speak German fluently, and I am able to write in it.
Same for French, I can hold and understand conversations, and can also write in it, yet, I am not the best in it.
I speak English fluently, and it is pretty easy for me to write in it.
I even spoke Swedish once, and wanted to learn Russian, but I postponed that for now, haha. Although, I really want to learn Russian one day, along with very basic Arabic perhaps, since I find it very interesting.