SAT® · Reading and Writing: Form, Structure, and Sense — Verbs and Verbals
When a Verbal Is the Right Choice
A clause needs exactly one finite (conjugated) verb to be complete. If that job is already filled, the blank takes a verbal like an -ing form instead; if the clause has no finite verb yet, the blank must supply one.
Every clause needs one finite verb: a verb that's conjugated to a subject and locked to a tense, like releases or produces. That finite verb is what makes the clause a real sentence instead of a fragment. A verbal - an -ing form, a past participle, an infinitive - looks like a verb but doesn't do that job. It can't stand alone as the clause's main action; it can only describe, modify, or add a side detail.
So when a blank shows up, ask one question first: does this clause already have its finite verb? If yes, the blank isn't allowed to add a second one for free. It has to be a verbal, usually -ing, attached to the existing clause as a modifier describing a result or accompanying detail. If no, the blank has to supply the missing finite verb, because something in the sentence still needs to be a real predicate.
This is why the same blank flips answers depending on what surrounds it. An opening -ing phrase is already a modifier dangling off the main clause, so the main clause after it still needs its own conjugated verb. But a blank sitting after a comma, once the main clause already has its verb, can only take the participle. Two finite verbs jammed together without a conjunction creates a run-on; two participles with no finite verb anywhere creates a fragment. Spotting which clause already owns its verb is the whole move, and it's the same check used across tense and aspect questions nearby: find the timeline-bearing verb first, then decide what every other slot is allowed to be.
Key terms
- finite verb
- A verb conjugated to a subject and tense, the one element that makes a clause a complete sentence.
- verbal
- A word formed from a verb, such as an -ing or -ed form, that acts as a modifier rather than the clause's main verb.
- participle
- An -ing or -ed verbal used to modify a noun or describe a result, not to serve as the main verb.
- run-on
- An error where two finite verbs or clauses are joined with no conjunction or punctuation to connect them properly.
- fragment
- A group of words punctuated as a sentence but missing a finite verb, so it isn't a complete clause.
Watch it explained
- How it worksHow does checking whether the clause already owns a finite verb settle that blank for you?
- How it worksHow do you tell an answer choice that adds a second predicate from one that only adds a modifier?
- Worked exampleWalk me through why 'The reaction releases heat, producing a faint glow' works and 'releases heat, produces a glow' fails.
Check yourself
End of topic.