A modifier tells the time, or manner of the action. Very often it is a prepositional phrase. A prepositional phrase is a group of words that begins with a preposition and ends with a noun. NOTE: A modifier of time usually comes last if more than one modifier is present.
Examples of prepositional phrases:
in the morning, at the university, on the table
A modifier can also be an adverb or an adverbial phrase. Here are the examples:
last night, hurriedly, next year, outdoors, yesterday
NOTE: Every sentence does not require a modifier. A modifier answers the question when? where? Or how?
Examples of modifiers:
John bought a book at the bookstore. NOTE: ‘at the bookstore’ is modifier of place.
Jill was swimming in the pool yesterday. NOTE: ‘in the pool’ is modifier of place and ‘yesterday’ is modifier of time.
He was driving very fast. NOTE: ‘very fast’ is modifier of manner.
The milk is in the refrigerator. NOTE: ‘in the refrigerator’ is modifier of place.
She drove the car on Main Street. NOTE: ‘on Main Street’ is modifier of place.
We ate dinner at seven o’clock. NOTE: ‘at seven o’clock’ is modifier of time.