everyone else is correct, and i imagine you’re quite satisfied now. but i have to put my linguistics minor to use SOMEwhere, so here ya go:
basically, some bishop in yon victorian times decided english sucked because it wasn’t latin. this was a very popular view at the time. he took it the extra step though, and wrote a whole book on how to make english more latiny. no split infinitives, no sentence-ending prepositions*, and so on. the upper classes took him at his word, because he was a bishop, and everyone else followed suit because talking like rich people is almost as good as actually being rich (this is also why BBC english had such a good run).
bishop whatshisface was, of course, not the first nor last person to invent language rules out of personal whim (never let someone argue you out of a double negative by using the math analogy [negative times negative]. language is neither math nor logic, which is why it is so much more useful in real life than they are). there is even a special linguistic term for invented grammatical rules: ipsi dipsic (sp). this is, appropriately, a latin term, and means something like “because i said so”
- quoth winston churchill: “that is a rule up with which i will not put”