Some English words don't follow standard spelling rules, making them tricky to learn. Though 'knight' and 'night' sound the same, their orthography differs greatly.
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Historical Spelling
English spelling can reflect the word's history, not always how it sounds today. The word 'debt' includes a 'b' due to its historical orthography linked to Latin.
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Influenced by Other Languages
English orthography is influenced by various languages, such as French and Latin. The 'ch' in 'chorus' reflects Greek origins in its orthography.