Philip says that Polly doesn't have any friends, but Polly doesn't care about Philip's opinions. She is a very busy woman. She has no time to worry about what her colleagues think of her.

any: Because 'doesn't' already carries the negation of this sentence, we use the affirmative term 'any' to express that Polly has 'no friends'. 'Any' is used primarily in interrogative and negative constructions. It is the negative equivalent of 'some'.

Note that 'any' cannot be used with a singular, countable noun: 'I don't have any friend' is grammatically incorrect.?????

Je ne comprends pas la subtilité de cette règle, ces deux paragraphes sur l'utilisation de any semble contradictoires