How to identify a sentence fragment

A period does not make a group of words a sentence. To check a sentence, find its subject and its main verb, then ask whether the clause expresses a complete thought on its own. If the answer is no, the punctuation may be hiding a fragment.

The three fast checks

1. Find the subject. Who or what is the clause about? A phrase such as 'After the long review of the report.' has no stated subject and main verb.
2. Find the finite verb. A participle or infinitive alone does not usually complete the clause: 'The candidate studying all night.' has no main verb.
3. Check for a dependent-clause word. Because, although, if, when, while, and similar subordinators can make a clause dependent. 'Because the test was difficult.' needs a main clause to finish the thought.

Fragments that look complete

A dependent clause often has both a subject and a verb, which can make it look like a sentence. 'Although the class ended' has a subject (class) and a verb (ended), but although signals that another thought is coming. Attach the clause to an independent clause: 'Although the class ended, the students stayed to review.'

An imperative sentence can be complete even though its subject is not written. In 'Check the verb,' the understood subject is you. Do not label every sentence without an explicit noun subject a fragment. Also watch for a complete independent clause followed by an unnecessary dependent clause set off as a sentence: 'The passage makes a clear claim. Although its evidence is weak.' The second sentence is the fragment.

Repair the fragment without changing the point

• Attach it to a nearby independent clause when the ideas belong together.
• Add the missing subject or main verb if the writer's intended meaning is clear.
• Turn it into a complete sentence by supplying the main clause for a dependent clause.
• Keep the fragment only when the context deliberately uses a fragment for effect and the writing situation permits it; standardized grammar questions usually expect complete sentences.

A quick test-taking routine

Read the underlined group by itself. Mark the subject and finite verb. If both are present, check whether a subordinating word makes the clause depend on something else. Then read the sentence around it: a group may be complete only because it is attached to the clause before it. This routine separates fragments from comma splices, which contain two independent clauses joined incorrectly.

On the FTCE, do not choose an answer just because it sounds short or starts with a conjunction. Decide whether the marked words form an independent clause in context. That is the grammatical test.

Check for a subject and a complete finite verb

A complete sentence usually has an independent clause: a subject and a finite verb that expresses a complete thought. “The candidates reviewed the outline” is complete. “The candidates reviewing the outline” lacks a finite verb; reviewing is a participle. “Reviewed the outline before the test” lacks a stated subject. A period does not repair either fragment.

A sentence can contain more than one clause, but every dependent clause must be attached to an independent clause. “Because the policy changed” has a subject and verb but remains dependent because because signals that an explanation is coming. Join it to a main clause: “Because the policy changed, candidates received an update.”

Recognize common fragment patterns

A subordinate-clause fragment begins with a word such as although, if, when, unless, or since and lacks a main clause. A phrase fragment may begin with a preposition—“After the long review”—or an infinitive—“To complete the project on time.” Attach it to a clause or revise it into a complete statement.

A relative clause beginning with who, which, or that may also be a fragment: “Which was difficult to interpret.” Connect it to the noun it describes and a main clause: “The chart, which was difficult to interpret, used a truncated axis.” In narrative writing, a fragment may be intentional for effect, but exam editing generally expects standard complete sentences.

Repair without changing the relationship

Join the fragment to the sentence it depends on, supply a missing subject or verb, or rewrite it as an independent clause. Preserve whether the phrase expresses time, reason, condition, or contrast. “Although the result was strong” should not become “The result was strong” if the contrast matters; add the opposing clause instead.

When deciding whether a short group of words is a fragment, read it with the preceding sentence. A sentence beginning with a transition or short answer may be acceptable in dialogue, but formal academic prose needs a clear grammatical connection. Punctuation should represent the structure rather than disguise an incomplete clause.

• Find a subject and finite verb for each independent sentence.
• Attach dependent clauses and phrases to a main clause.
• Check relative clauses beginning with who, which, or that.
• Use a period only after a complete independent clause.
• Repair the fragment while preserving its logical relationship.

Check for a missing main clause after a transition

A sentence that begins with although, because, if, when, or while needs a main clause unless the dependent clause is attached to the previous sentence. “Although the directions were clear” leaves the contrast unfinished. Join it to the point it qualifies: “Although the directions were clear, several candidates skipped a step.” A comma after the fragment alone does not complete it.

Some fragments are intentional in conversation or literary style, such as “Not today.” In formal explanatory writing, revise unless the effect is deliberate and the audience expects it. Exam editing generally favors complete sentences, but do not mistake a short complete imperative—“Read the chart carefully”—for a fragment; its subject you is understood.