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In this example, under the lifeguard chair, the preposition
under takes the noun lifeguard chair as the object of the
preposition.

The combination of a preposition and an object is called a
prepositional phrase. Phrases by themselves are only fragments,
or building blocks. They must be combined with other parts to
form a complete sentence or unit.

Let’s connect the phrase around the pool with the noun
Susan and the verb walks to form a complete sentence. When
we add Susan as the subject, we must also include the verb,
since Susan, as the subject, performs the action of the verb.

A noun used after a preposition

is called the object of the preposition.

Susanwalks around the pool.

Subject Verb Preposition Object of Preposition

Ben standsunder the lifeguard chair.

Subject Verb Preposition Object of Preposition

Subject and Verb form a Unit,

extended to include a phrase.

Subject and Verb form a Unit,
extended to include a phrase.

Building Block

Building Block

Example:underthe lifeguard chair

Preposition Object of Preposition

Example:

Example: