It is very useful to improve your language skill that try to write some thing. I have been learning English for a while, but I think I just got a little progress. so I try to figure out why, and try to find a way which more useful for my English skill, then I realized writing some thing down use your own sentences is really helpful for improving my English. In this place, italki, it is very interesting to write down something and then a lot of people give you different corrections. And you can read the composition those other people written in your native language, so you can find out how the people express the things using your native language and you can correct it. I think that is very interesting.