Another website that spawned a book, Paul Brians’ Common Errors In English Usage is a vital and hugely entertaining encyclopaedia of, erm, common errors in English usage. It’s a great demonstration of how fluid the English language and how swiftly it changes – and it’s an essential reference tool for anyone who cares about being accurate in their use of English too.

The complete list of errors is here but it’s worth reading Brians’ notes about what constitutes an error and his methods used in compiling the book first.

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