Defining a Gerund
According to “The Chicago Manual of Style,” a gerund is a verb, specifically a present participle, that functions exactly like a noun. For example: “Being a jerk won’t accomplish anything.” In this case, the verbal phrase “being a jerk” acts like a noun. Gerunds needn’t be the subject of the sentence in which they appear; they can also be the object of a verb or of a preposition.
The Use of a Comma
It isn’t easy to pin down the exact use of a comma. First, commas have several distinct functions. They can be used to separate items in a list, to separate clauses or even to indicate that the reader should pause. Also, how and when a writer deploys a comma can be a matter of individual discretion rather than dictated by a clear rule. According to “The Chicago Manual of Style,” the “use of the comma involves good judgement, with ease of reading the end in view.”
The Gerund as Subject
When the gerund functions as the subject of a verb, it is rarely acceptable for a comma to precede it. However, it can follow a comma if the sentence begins with a conjunctive adverb such as “otherwise” or “consequently.” Here’s an example: “Consequently, complaining a lot made him very unpopular.” The gerund “complaining a lot” is the subject of the verb “made” and follows a comma.
The Gerund as Direct Object
Sometimes a gerund can be the object of a sentence’s primary verb. For example: “I love your writing.” The gerund in this case is “writing” and is the object of the verb “love.” Just like when the gerund is the subject of the verb, it’s relatively rare to precede it with a comma. Still, there are some instances that justify it. Consider this example: “I love, above all else, your writing.” Notice here that the comma is used poetically to separate “above all else” from the remainder of the sentence. More often than not, a gerund as direct object is preceded by a comma used for stylistic purposes.