Hi, according to lawlessfrench, partitive articles are used with uncountable nouns.
But you say "Note that when the adjective is placed BEFORE a plural noun, the partitive article des (some) becomes de (or d' in front of a vowel or mute h) "
Also your example "J'achète de beaux draps." (I think that drap is a countable noun)
If it is used with uncountable nouns, why do you use partitive article with countable noun "drap"?
Thank you.