A sentence fragment is missing one of three things: a subject, a working verb, or a complete thought. To fix one, add the missing piece, join the fragment to the sentence next to it, or drop the word that made it incomplete, such as because or although. On the Digital SAT, fragments hide inside punctuation choices, so you check each side of the blank before you pick a mark.
You can practice fragment items in our Digital SAT question banks, sorted by test date. The rules below come from our Sentence Boundaries lesson notes.
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Video: What Counts as a Sentence. From the Mr. O series Joining Two Complete Sentences: Period, Semicolon, or Comma + FANBOYS.
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Question banks: October 2026 English question bank
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What College Board tests
Fragments fall under the Boundaries skill of the Standard English Conventions domain. College Board's framework says that for Boundaries, "students must edit text to ensure that sentences are conventionally complete," and its Between Sentences testing point reads: "Students will use contextually appropriate punctuation to properly mark the end of a sentence" (Assessment Framework for the Digital SAT Suite). That means you decide whether the words on each side of a period or semicolon can stand alone.
The two-question test
Every time you look at a chunk of text, ask two questions. Is there a subject, the who or what the sentence is about? Is there a conjugated verb, one that matches the subject and shows a tense? Both yes means you have a sentence. Either no means you have a fragment. One more check catches the rest: a word like because at the front can leave a clause with a subject and a verb still unfinished.
| Conjugated (can be the main verb) | Not conjugated (cannot be the main verb alone) |
|---|---|
| writes, wrote, is writing, has written, will write | writing, written, to write |
| Maya writes every morning. | Maya writing every morning. |
That one difference, conjugated or not, sits behind most fragment questions on the test.
Complete sentence or fragment? 10 quick checks
These lines come from common homework quizzes. Cover the answer column and decide first.
| # | Words | Answer |
|---|---|---|
| 1 | Type that faster. | Complete. It is a command, and the subject "you" is understood. |
| 2 | Show them. | Complete. Another command with "you" understood. |
| 3 | Asks a question. | Fragment. No subject. Fix: She asks a question. |
| 4 | Is giggling loudly. | Fragment. No subject. Fix: The baby is giggling loudly. |
| 5 | In here. | Fragment. No subject and no verb. |
| 6 | Because the test was difficult. | Fragment. "Because" leaves it unfinished. Fix: The test was difficult. |
| 7 | Before signing in, you must first register for an account. | Complete. |
| 8 | Unless you're already a member of the site. | Fragment. Fix: join it to the sentence before it with a comma: ...register for an account, unless you're already a member of the site. |
| 9 | The old map hanging in the hallway. | Fragment. "Hanging" is not conjugated. Fix: The old map hangs in the hallway. |
| 10 | Which surprised the whole class. | Fragment. A statement that starts with "which" cannot stand alone. |
One quiz asks which sentence correctly fixes the fragment "Because the test was difficult." The answer is "The test was difficult." Dropping "because" leaves a subject, a verb and a finished thought. "Although difficult" and "During the difficult test" are still fragments. Another quiz asks which element must be added, a subject or a predicate. A predicate is the verb part. Lines 3 and 4 above need a subject. Line 9 needs a working verb, which is part of the predicate.
See which question types are costing you points
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The six fragment types the SAT uses
| Type | Fragment | Fix |
|---|---|---|
| 1. -ing or "to" verb with no helper | The volunteers planting trees along the river. | The volunteers planted trees along the river. |
| 2. Subordinating word with no main clause | Although the museum opened in 1990. | Although the museum opened in 1990, it added a new wing last year. |
| 3. Statement that starts with who, which, where or whose | Which is the oldest bridge in the city. | The Stone Bridge is the oldest bridge in the city. |
| 4. "Many of whom" or "most of which" | Many of whom train every morning. | Many train every morning. |
| 5. Participial phrase with no main verb | Founded by two sisters in 1952. | Founded by two sisters in 1952, the bakery still uses their recipes. |
| 6. Reported question in question order | The team wanted to know how could the flooding be stopped? | The team wanted to know how the flooding could be stopped. |
Two warnings from the notes. First, an -ing word is not always wrong. It can be the subject, as in "Hitting the target was the goal," or describe a sentence that already has its own verb. Second, the reverse trap matters as much: if the sentence already has its main verb, a choice that adds a second conjugated verb with only a comma between them is wrong. Our notes call this the Two-Verb Alarm.
Video: The Missing Verb Disguise. From the Mr. O series Joining Two Complete Sentences: Period, Semicolon, or Comma + FANBOYS.
Three ways to fix a fragment
| Fix | Before | After |
|---|---|---|
| Join it to the next sentence | Because the bus was late. We missed the opening song. | Because the bus was late, we missed the opening song. |
| Add the working verb | The coach waiting by the gate. | The coach was waiting by the gate. |
| Drop the subordinating word | Although the plan worked. | The plan worked. |
Three Digital SAT-style items
We wrote these for this page. Try each before reading the answer.
1. Supply the missing verb
In 1931, engineer Dora Pell designed a folding bridge for narrow canals. Ten years later, Pell ______ the same hinge to build a ferry ramp.
- to use
- used
- using
- to have used
Answer: B. The second sentence has a subject, Pell, but needs a conjugated verb. "Used" is the only one. "To use" and "to have used" are infinitives, and "using" is an -ing word with no helper.
2. When the -ing phrase is the subject
Early electric scooters ran on a single battery cell. As riders pushed for longer trips, the cells ran hotter. ______ a heat limit beyond which the cells wore out faster than they could be replaced pushed designers toward a two-cell design.
- Upon hitting
- They hit
- When they hit
- Hitting
Answer: D. Find the main verb first: "pushed." Nothing before it can be its subject yet, so the blank must build one. "Hitting a heat limit..." is a gerund phrase that works as the subject. Choice A is a prepositional phrase, which cannot be a subject. Choice B adds a second verb, "hit," next to "pushed." Choice C makes a dependent clause, which cannot be the subject of "pushed."
3. A comma before a fragment
Two researchers built a model of how rivers carry sand to the sea, and the model relies on computer simulations. The researchers stress the need for field ______ suggesting long-term river surveys as the best next step.
- data; however,
- data. However,
- data, however,
- data, however;
Answer: C. "Suggesting long-term river surveys as the best next step" has no subject and no conjugated verb, so it is a phrase, not a sentence. A period or a semicolon would promise a full sentence that never arrives. Only a comma can sit in front of it, and "however" takes a comma on each side here.
Keep practicing
Fragments connect to the rest of the boundaries skill. Our page on independent and dependent clauses covers the comma after a clause that starts with "because" or "although." SAT comma splices and sentence fragments has a practice set, and the period rule for independent clauses shows when a period is the right mark. Every rule sits on one page in the SAT grammar rules cheat sheet.
The Joining an Incomplete Clause lesson notes go deeper on -ing and -ed phrases, and they need a free account. The June 2026 English question bank is free to open. When you want a timed check, create a free account and take one full-length adaptive practice test free.
Frequently Asked Questions
What is a sentence fragment?
A group of words punctuated like a sentence that is missing a subject, a conjugated verb, or a complete thought. Because the test was difficult has a subject and a verb, but because leaves the thought unfinished.
How do you fix a sentence fragment?
Add the missing subject or verb, join the fragment to the sentence next to it with a comma, or drop the subordinating word. Because the test was difficult becomes The test was difficult.
Is Type that faster a complete sentence or a fragment?
It is a complete sentence. It is a command, and the subject you is understood. Show them works the same way.
Is an -ing word ever correct on SAT fragment questions?
Yes. An -ing phrase can be the subject, as in Hitting the target was the goal, or it can describe a sentence that already has its own verb. It is wrong only when it tries to be the main verb with no helper.
Which element must be added to make a fragment a complete sentence?
It depends on what is missing. Is giggling loudly needs a subject. The old map hanging in the hallway needs a working verb, which is part of the predicate.