It’s actually very simple: there are some pronouns that we use after prepositions, and some that we don’t. In technical terms, prepositions have an object, and we use the dative form of pronouns to show this. Now, since I won’t be explaining either objects or dative forms for a while yet, this may not make
Use ‘who’ and ‘whom’ for people (and for words that describe people) This seems obvious but more and more writers are using that as the relative pronoun to describe people. I have two theories why this happening: partly because people are worried about misusing either who or whom and look for another word to use
Does the difference between ‘who’ and ‘whom’ really matter? No man is an island, entire of itself: every man … is a part of the main … any man’s death diminishes me, because I am involved in all mankind, and therefore never send to know for whom the bell tolls; it tolls for thee. John