https://www.grammar-quizzes.com/clauses-8.html this site well explains about 'of which'. i sort of understand where to use it and what it means.
He bought a car, the brand name of which I can't remember.
this is one of examples on that site and here is another one.
a verb of which it is the subject.
as far as i know, i can place the preposition in front of a relative pronoun when the sentence ends with it. but in that sentence, the presence of the 'it' really confuses me and now i can't fathom what that sentence means. i really don't see the place where 'of' is able to go when i rephrase it.
could it be
a verb whose the subject is the verb itself.
?? i need help :(