A gerund phrase is a phrase consisting of a gerund and any modifiers or objects associated with it. A gerund is a noun made from a verb root plus ing (a present participle). A whole gerund phrase functions in a sentence just like a noun, and can act as a subject, an object, or a predicate nominative.
If you look up the definition of gerund (pronounced JER-und), you will find that it means “an English noun formed from a verb by adding -ing”; that is, a present participle used as a noun.
ex. Traveling is a good way to expand your worldview.
My passion is reading.
My doctor suggests running to improve my health.
In all three of these examples, words ending with -ing are acting as nouns. Traveling is the subject of the first sentence. In the second sentence, reading is a predicate nominative, a word (or group of words) that completes a linking verb and renames the subject. The verb is, a form of the linking verb to be, is followed by reading, which renames the subject my passion. In the third sentence, the gerund running is acting as the object of the verb suggests.
How Do Gerund Phrases Work? They Act Like a Noun
Gerunds can appear alone or band together with other words to form a gerund phrase. Collectively, this phrase behaves like a single noun. ex .Running is a favorite activity of mine. Running with scissors is a favorite activity of mine. Both the gerund and the gerund phrase above function as subject nouns and take the third-person singular verb is. We could substitute a non-gerund noun such as chess to mentally confirm its function. Chess is a favorite activity of mine.
Not Acting Like a Noun? It’s a Participle Phrase
Gerund phrases can easily be confused with participle phrases. It is possible, for example, to encounter the gerund phrase we used above in a context where it is not acting like a noun. When used as a modifier—that is, as an adjective or adverb—it is now a participle phrase.
ex. Running with scissors, Tim charged after the cat.
Here, running with scissors modifies the verb charged. It gives us further information about how Tim charged.