The pronoun "they" can be used as a singular pronoun when it is used to refer to a person whose sex is not known or specified. Below are some examples.
Many grammarians and English teachers oppose the use of they (and its other forms: their, them, themselves) as a singular pronoun and encourage students to use "he or she" instead. However, because English does not have a common-gender, or gender neutral, third person singular personal pronoun, writers and speakers often use they. It is a well-established use. It can be used like in the examples above, when the gender of the person referred to is not known, and it can be used to refer to indefinite pronouns such as everyone, someone, and anyone, as in the examples below.
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