by Rachel Bladon, Jane Chishom
How good is your spelling? If you are never quite sure when i goes before e, or a word ends in ance or ence, this is the book for you. Clear and simple explanations unravel the rules and regulations of English spelling – as well as all those frustrating exceptions – with special emphasis given to tricky words that people often get wrong.
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http://usafiles.net/Fkc/Improve_Your_Spelling_with_tests_and_exercises.pdf