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Oxford Dictionaries: Do You Know Your Ibles From Your Ables?
Rules and examples for words ending in the suffixes -able and -ible.
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Oxford Dictionaries: Verb Tenses: Adding Ed and Ing
Spelling rules and word lists for adding -ed and -ing endings to verbs.
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Oxford Dictionaries: Words Ending in Sion, Tion, and Cion
Learn the spelling rules involving when to use an "s," "t," or "c" when adding an "ion" suffix.