@kandersonus I've heard that rule is a fossil from 19th century grammarians who were obsessed with making English more like French or Latin. We apparently call them "prepositions" because they really do necessarily come first in phrases in French or Latin, but English doesn't really have prepositions but rather particles that, as particles often do, get their placement by convention. Ditto "split infinitives"...we don't have infinitives. We have an infinitive-marking particle.