Until you introduce whom (and, occasionally, whose) and native speakers’ brains explode. It’s soooo easy: Whose brain was exploded by whom? His brain was exploded by her, not He brain was exploded by she. Native English speakers do understand cases, they just don’t know that they understand.
This actually makes more sense than the arbitrary grammatical genders. (Sure, english has it simpler with, “from where”, “where” and “where to”)
Until you introduce whom (and, occasionally, whose) and native speakers’ brains explode. It’s soooo easy: Whose brain was exploded by whom? His brain was exploded by her, not He brain was exploded by she. Native English speakers do understand cases, they just don’t know that they understand.