The object of a preposition is a noun or pronoun that comes after a preposition, such as in, on, at, to, to form a prepositional phrase. After his exams Tom will take a trip. After his exams is a...
No, some compound prepositions are idiomatic, in the English language. An example of this would be "according to".
no it is followed by a noun or a pronoun.
TO and FOR express the order. TO goes before a verb, and FOR before a noun.
"Get" is a verb.