Thread:User talk:CodeCat/Determiner Forms

There is a category "pronoun forms" when I enter head|mk|pronoun form but no such category for determiner forms. I need one - could you make it? I tried making it by simply adding head|mk|determiner form, but it appears as red at the bottom of the page later on and when I go visit it, although the list of all determiner forms is there, it asks me to create the page because it doesn't exist yet. I don't know what the problem is.

Thank you in advance