> Edit 2: Intel also makes compilers, to which I own, but never use. I see this more and more often on Reddit, from posters I assume are millennials, and I am

> Edit 2: Intel also makes compilers, to which I own, but never use. I see this more and more often on Reddit, from posters I assume are millennials, and I am interested in the psychology of this error. Why do you put a "to" before "which"? You would not say "I own to an Intel compiler". I never see people make this mistake with other pronouns, either: for instance, they will correct turn "I saw pg yesterday" into "pg, whom I saw yesterday". What is it about "which" specifically that makes it hard for kids to use?