You don't need to know how to speak Latin and Greek in order to understand English, but some words in English come from those languages. It's helpful to know how some Greek and Latin words change from singular to plural.

Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-nouns/e/irregular-plural-nouns--foreign-plurals?utm_source=YT&utm_medium=Desc&utm_campaign=grammar

Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-nouns/v/bonus-video-origin-of-the-mutant-plural-the-parts-of-speech-grammar?utm_source=YT&utm_medium=Desc&utm_campaign=grammar

Missed the previous lesson? https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-nouns/v/irregular-plural-nouns-part-iv-the-parts-of-speech-grammar?utm_source=YT&utm_medium=Desc&utm_campaign=grammar

Grammar on Khan Academy: Grammar is the collection of rules and conventions that make languages go. This section is about Standard American English, but there's something here for everyone.

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