A great reminder and some humor too!
Who’s a who and what’s a that?
A common word mix-up occurs in the “X (who) (that) did Y” construction.
This should be an easy one: Who refers to people and that refers to things.
The error generally is made using that to refer to people, as in “Smith was the wide receiver that scored three touchdowns against State.”
Smith is who, not a that
Try this memory jogger:
Who is you That is fat.
That should discourage the error.
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