Proper adjectives have their initial letter capitalised, for example American - derived from a proper noun America - or Victorian - derived from (queen) Victoria.
Common adjectives, on the contrary, don't have their initial letter capitalised , for example green, empty, colourful. Just remember that "common adjective" is not a scientific term used by linguists, it is informal.
Proper adjectives have their initial letter capitalized ;
Proper adjectives begin with a capital letter and derive from proper nouns, like 'American.' Common adjectives do not capitalize and describe general qualities, like 'happy' or 'blue.' Recognizing these differences is essential for proper grammar in English.
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