Commonly Confused Words & Spelling

English spelling is full of traps that catch even careful writers. The rules exist — they are not arbitrary — but they are layered on top of each other from centuries of borrowing from Latin, French, Norse, and Greek, each language leaving its own logic behind. Why does occurring double the r but opening does not? Because the stress falls on the second syllable of occur and the first of open, and English doubles the final consonant only when the stress precedes it. Why is tying correct and tieing wrong? Because verbs ending in -ie swap the ie for a y before adding -ing — a rule that prevents the awkward vowel cluster i-e-i. Our grammar and spelling guides explain the actual rule behind each confusion, show the common error in context, and give enough examples for the correct form to stick. Each guide covers etymology when it sheds light on the spelling, lists similar words that follow the same pattern, and includes example sentences from edited prose.