What are some of the biggest challenges for ESL/EFL learners? Language specific is probably best, but generalizations would work, too, I suppose. Whether you yourself have learned ESL or EFL, you've taught ESL/EFL, or you just know a lot about these challenges, any information would be great. I am particularly interested in Japanese speakers learning English, as I'm learning Japanese and planning on doing the JET program in a few years. Other languages heavy in the U.S., like Spanish, would also be good.
I'm having to choose a topic for a linguistics research paper this week, and since I'm interested in teaching ESL/EFL one day, I thought that looking into that might be good idea. If I could write only about Japanese English learners, I would, but I've already done a lot of research and haven't found much. So, I'll probably focus on a few different languages.
Also, if anyone knows of any informative books, websites, or journals, on this topic, I would love to know about them. I need to find some more academic resources, and my school's library seems to be a bit lacking.