Answer:
over the hill; through the garden.
Explanation:
A preposition can be defined as a word that shows or illustrates the relationship between a pronoun or noun and other words in a sentence. Some examples of a preposition used in various literary works in English language are up, below, after, by, against, for, over, at, to, etc.
The main purpose of a preposition as a part of speech is to introduce an object (of, upon), indicate a timeframe (from, by, over), show direction (to, across, along), location or place (at, up, after, below) and to illustrate the spatial or sequential relationship between two or more things, people, place, etc.
A prepositional phrase can be defined as a phrase that starts with a preposition such as over, through, to, below, on, etc., and ends with a noun such as hill, garden, bridge, school, hospital, etc.
In this scenario, the prepositional phrase in the sentence are "over the hill" and "through the garden."
