PainInTheEnglish.com

This site is designed for English learners to keep a database of things that they have learned. Every day, I come across a few troubles with English. I usually ask people around me for answers, but a few months later I forget them. Since this is a web-based database, I can store tidbits that I learn every day from anywhere. If I come across the same problem again, I can look it up, so I would not have to bother anyone about it.
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  thanks to MetaFilter

This is a great site for those of us who think they already know English.