Category:German verb second-person forms, Category:German verb subjunctive forms, Category:German verb singular forms, ...
They seemed kind of pointless to me, like categorising for the sake of categorising.
They are added automatically by {{de-verb form of}}.
{{de-verb form of}}
Yes, I removed that.
But the categories are still full of pages
That's just because the software is slow with updating. If you do a null edit on the pages they go away.