The Singular 'They'(mentalfloss.com)
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The Singular 'They'
https://www.mentalfloss.com/posts/singular-they-history
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If you listen to someone whose first language is something like Spanish or French but isn't totally fluent in English you'll hear them use "he" instead of singular "they". It's not an egregious error but it definitely sounds a little strange (at least to my ear).