How kids learn when to use capital letters: It’s not just about rules

More than one‐third of the world’s population uses a writing system that includes both uppercase and lowercase letter forms. In these writing systems, capitalization is the use of an uppercase form for the first letter of a word. Learning to capitalize in English requires a speller to identify two clues: a word’s type (capitalize if it’s a proper noun, i.e., a specific person, place or thing), and its sentence position (capitalize if it’s at the start of a sentence).

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