Goold Brown,
The Grammar of English Grammars…
“ How can to be a "preposition" in the phrase, "He was listened to," and not so at all in "to be listened to?" How does the infinitive "express an action or state indefinitely," if it "usually relates to some noun or pronoun?" Why must its agent "be in the objective case," if "to improve relates to the pronoun he?" Is to "in every other case a preposition," and not such before a verb or a participle? Must every preposition govern some "noun or pronoun?" And yet are there some prepositions which govern nothing, precede nothing? ”
