I came across a website in the course of my job that I thought might be of use to people whose first language isn't English. I'm putting the topic here because it could be useful for fanfic
The site is
Dave\'s ESL Cafe . There are lots of links related to learning English as a foreign language, and there's also a discussion forum for students of English to talk to each other.
But perhaps most useful from a writing point of view is the
Help Centre , where ESL teachers will answer questions about grammar, word usage, syntax and so on. I had a look at a few of the threads - some of the questions are quite sophisticated, and the answers try to explain the grammatical or usage rule as clearly as possible. The teachers are American, so a couple of times I felt that UK English would give a different answer, but that's no big deal.
Hope some of you find it helpful.
Wendy