Test your own language skills!
I’ve just spent a good hour on the BBC Skillswise site after finding loads of helpful little English language games. These are aimed at adult literacy learners, but I think some might help with students learning English as a second language too.
As someone who didn’t learn anything about grammar at school, (compound sentences, anyone?) these were very helpful to me, even if just to learn what I’m actually applying in my everyday use of the language. My favourite is the homophones game. Some of the games are very basic, but it never hurts to refresh your skills… you might learn something new! Also, knowing how to use correct grammar in your own language is key to learning another language and how it works.