Aunt Tillie and her younger sister ruby also shared their experiences as nurses in world war 1.
Their is the possessive pronoun, as in "their car is red"; there is used as an adjective, "he is always there for me," a noun, "get away from there," and, chiefly, an adverb, "stop right there"; they're is a contraction of "they are," as in "they're getting married."
A possessive pronoun is a pronoun that is used to express ownership or possession. For example, the word hers is a possessive pronoun in the sentence Charlotte noticed that Seth's dog was bigger than hers.
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