"My" stays the same regardless of whether it refers to one thing or many things.

This is my book.

These are my books.

khoffMy" stays the same regardless of whether it refers to one thing or many things.This is my book. These are my books.

I think the OP meant the plural form of the genitive (possessive) pronoun.

"My" = 1st person singular pronoun.
"Our" = 1st person plural pronoun.

BillJ

Obviously that's what Clive thought too, and you may well be right. I just never thought of "our" as the "plural" of "my" (in the sense that "mes" is the plural of "mon" or "ma" in French.) We'll never know what the original poster meant, unless he or she comes back and tells us.

khoff I just never thought of "our" as the "plural" of "my" (in the sense that "mes" is the plural of "mon" or "ma" in French.) We'll never know what the original poster meant, unless he or she comes back and tells us.

So true. And French is not unique in this respect. Depending on the native language of the OP this could very well have been the intent of th