A pronoun is any little word or set of words used to replace a noun (I, you, he/she/it, we, you they – personal subject pronouns; or, such as: me, you, him/her/its, us, you, them – personal object pronouns).
An idefinite pronoun is a pronoun that is not referred to any given person or thing, it is “not definite”, but is instead vague.
To help remember them, especially for a beginner lerner of the English language it could be of use to have them all collected together in one single place, like this one.
Two useful charts to review and keep at hand at all times.
Chart n. 1
Chart n. 2
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