In my little Spanish learning experience, I have often read the sentence that uses the term ir de compras
. While I know the meaning of it (go to shopping), I have a trouble in getting the etymology of it.
Why does it uses the form used in second-person singular? For example, we use dormir
in Leo un libro antes de dormir.
, even if the verb is used after de
. We don't write it as Leo un libro antes de duermes.
. But it is not the case in the ir de compras
.
So why does it always use the second-person singular form?