Explanation of using 'that,' 'which,' and 'who' in English sentences.
That is used to refer to a specific thing, which introduces additional information, and who is used for people.
For example, 'I will buy anything that comes along' or 'It was at that strange little shop that Nimra bought a scarf from.'
When comparing 'I'll speak with the man who runs this place' and 'I'll speak with the man that runs this place,' both are used informally, but formal writing often prefers who for people.
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