"I have to buy flour because there isn't any more left."
Translation:Je dois acheter de la farine parce qu'il n'y en a plus.
I'm still a little clueless as to when to use "le, la, les" in those contexts when it wouldn't be used in English. I think Lynn is saying when it's greater than 3 but my Maths is worse than my French. But with reference to flour, 3 what? Grams, kilograms, grains? Can anyone help this dimwit?
Lynne was simply drawing a heart at the end of the comment, no maths required. French use le/la/les/l' in these instances most of the time - the exception is when preceded by an expression of quantity, ie beaucoup de, assez de, trop de etc, then you drop the le/la/les/l'. I hope this helps