They're not even good at being pedantic. It should be '"them' is not singular," with single quotes around 'them.' The sentence means to refer to the word itself, not the concept the word points to: Paris is a city in France, but 'Paris' has five letters. Philosophers call it the use/mention distinction; getting it right eliminates a lot of confusion when you're switching between talking about words and talking about concepts.
"Them is not singular", and not "Them are not singular"?
Which makes more sense, "the yolk of the egg are white" or "the yolk of the egg is white"?
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Actually white yolks are pretty common in organic or free roaming chickens, or from areas where corn and alfalfa are not as large a part of the feed
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They're not even good at being pedantic. It should be '"them' is not singular," with single quotes around 'them.' The sentence means to refer to the word itself, not the concept the word points to: Paris is a city in France, but 'Paris' has five letters. Philosophers call it the use/mention distinction; getting it right eliminates a lot of confusion when you're switching between talking about words and talking about concepts.
Ceci n'est pas un pronom.