Q: Why would someone write “approach” and “make” instead of “approaching” and “making” in the following sentence? “In the video, you can see a man and woman in a canoe approach the deck and make off with a fishing pole.”
A: Either infinitives (“approach,” “make off”) or gerunds (“approaching,” “making off”) would be correct in that sentence, which is on the website of KIII, the ABC television affiliate in Corpus Christi, Texas.
Here “you” is the subject, “can see” is the verb, and all the rest is the direct object (some grammarians would refer to “a man and woman” as the direct object and what follows as the object complement, predicative complement, or objective predicate).
A direct object, as you know, is what’s acted on by a verb. It can be a noun as well as a noun substitute, such as a pronoun, infinitive, gerund, or (in this case) a phrase.
As for the sentence you’re asking about (“In the video, you can see a man and woman in a canoe approach the deck and make off with a fishing pole”), the verbs “approach” and “make off” are bare, or “to”-less, infinitives.
Technically, an infinitive is a non-finite or unmarked verb form—that is, a verb without time, person, or number. In the sentence above, the two bare infinitives are being used to complement (or help complete) the object—“a man and woman in a canoe.”
The two gerunds you suggested (“approaching” and “making off”) are also unmarked verb forms, and could similarly be used to complement “a man and woman in a canoe.”
Both infinitives and gerunds are often used after verbs of perception like “see,” “hear,” and “feel”: “We saw them flee/fleeing” … “They heard the boy snicker/snickering” … “I felt the wasp sting/stinging me.”
We’ve published several posts on our blog, the latest three months ago, about why some verbs take gerunds as direct objects, others infinitives, and still others can take either one.