This word class usually stands in stead of another word class, and can also be used as determiners. There are special "stand-alone" forms
What are "pronouns"? They replace nouns (boy = he); they can be used as determiners: my cousin; and they have separate "stand-alone" forms:
my house = this house is mine; that book is yours; these shoes are hers.
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THis Word class can be found functioning as a subject complement
What are "Adjectives"?
Examples: Lucy is smart; the frog is green