To start writing in another language and develop that skill, one could begin by making comments in that language in suitable online forums.
Start with by finding a site that lends itself to one-word comments. A photography site such as Flickr.com would do the trick.
You could start by reading what other people have written. Then you might re-use some of those comments yourself—if you feel that they apply—to other photos. Cut and paste if you need to (e.g. if the script is hard to wangle on your keyboard).
Gradually you’ll read, understand and be able to manipulate longer phrases and sentences.