The prepositional phrase in the sentence "When Jo forgot her key, she knocked on the window". is "on".
<h3>What is prepositional phrase?</h3>
A prepositional phrase is a collection of words that includes the preposition, the object, and any modifiers of the object. Prepositional phrases frequently modify verbs or nouns. Adverbial phrases and adjectival phrases are the names of these two categories of prepositional phrases, respectively.
One preposition and the object it affects make up a prepositional phrase, which is a sentence component. A clause, gerund, or noun may serve as the object of a prepositional phrase. A prepositional phrase is shown here (in italics): She was early for the bus. The adverb of time is "on time."
A prepositional phrase is one that has a preposition at the beginning and a noun or pronoun at the end.
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