Sentence fragments that begin with subordinating conjunctions

A subordinating conjunction shows how one clause depends on another. It can signal cause, time, contrast, condition or concession. When writers put a dependent clause after a period, they often create a sentence fragment: “Because the directions were unclear.” The clause contains a subject and verb, but it leaves the reader waiting for the main point.

Why a subordinating conjunction makes the clause dependent

In “The class ended early,” the clause can stand alone. Add because—“Because the class ended early”—and the reader expects a main clause explaining what happened as a result. Common subordinators include because, although, since, when, while, if, unless, before, after and whereas. The clause may contain a subject and a verb and still be incomplete as a sentence.

Connect the dependent clause to a main clause

A dependent clause can appear before or after an independent clause. When it opens the sentence, use a comma after it: “Because the directions were unclear, the class asked for an example.” When it follows the main clause, a comma is usually unnecessary for an ordinary restrictive adverbial clause: “The class asked for an example because the directions were unclear.” The main clause completes the thought in both versions.

Common repairs

• Fragment: “Although the evidence was strong.” Repair: “Although the evidence was strong, the committee requested another review.”
• Fragment: “When the bell rang.” Repair: “When the bell rang, students left the room.”
• Fragment: “If the application is incomplete.” Repair: “If the application is incomplete, the reviewer will request more information.”
• If the subordinating word is unnecessary, remove it and make the clause independent: “The evidence was strong.”

Do not confuse emphasis with formal correctness

Writers sometimes use fragments intentionally in advertising, dialogue or journalism for emphasis. Editing questions on a formal standardized exam usually expect complete sentences unless the passage clearly uses a deliberate stylistic fragment. In an essay, use a fragment only when the rhetorical effect is clear and appropriate to the task.

Exam checklist

1. Find the period and identify the clause after it.
2. Look for a subordinating conjunction at the start.
3. Ask whether the clause expresses a complete main thought on its own.
4. Join it to a logically related independent clause or remove the subordinator.
5. Use a comma after an introductory dependent clause.

Key takeaway

A sentence that starts with because, although or another subordinator usually needs a main clause. Combine the dependent thought with an independent one to complete the sentence.

A dependent clause needs a main clause

A dependent clause has a subject and verb but begins with a subordinating word that makes the thought incomplete on its own. Words such as because, although, when, while, unless, and since can create this dependency. “Because the schedule changed” contains a subject and verb, but it leaves the reader waiting to learn what happened. Standing alone, it is a fragment in formal prose.

Attach the dependent clause to an independent clause: “Because the schedule changed, candidates received a new notice.” If the dependent clause follows the main clause, a comma is often unnecessary: “Candidates received a new notice because the schedule changed.” Use a comma after an introductory dependent clause to make the boundary clear.

Do not confuse a dependent clause with a phrase

A prepositional phrase such as “after the review” has no finite verb, while “after the review ended” contains a subject and verb but remains dependent because of after. Both can be sentence fragments if used alone, but the repair differs. A phrase may be attached to a complete clause; a dependent clause must be joined to a main clause or rewritten with a different structure.

An -ing phrase can also look like a clause but lack a finite verb: “While reviewing the instructions.” Add a subject and main verb or connect it to the rest of the sentence: “While reviewing the instructions, Lena noticed an error.” Check that the introductory phrase modifies the correct subject as well.

Punctuation does not make a fragment complete

A period, semicolon, or exclamation point cannot turn a dependent clause into an independent one. “Although the evidence was limited; the team continued” misuses the semicolon because although the evidence was limited cannot stand alone. Use a comma and a main clause: “Although the evidence was limited, the team continued.” A colon also requires a complete clause before it when it introduces an explanation.

Some fragments are used intentionally in conversation, advertising, or literary writing for effect. In standard exam editing, assume a formal complete sentence is required unless the context clearly uses deliberate fragments. When revising, preserve the original meaning and relationship rather than simply deleting the subordinating word.

• Look for subordinating words followed by a subject and verb.
• Join the dependent clause to a main clause.
• Use a comma after an introductory dependent clause.
• Do not use semicolons to join dependent clauses to independent clauses.
• Check the clause subject after adding an introductory phrase.

Use clause order to punctuate the sentence

A dependent clause can precede or follow the main clause. When it comes first, a comma commonly marks the boundary: “When the review ended, the candidates left.” When it follows the main clause and is essential to the relationship, no comma is usually needed: “The candidates left when the review ended.” The clause remains dependent in either position; moving it does not make it a sentence.

A relative clause beginning with who, which, or that may be restrictive or nonrestrictive. An introductory relative fragment such as “Which caused confusion” must attach to a main clause: “The labels changed, which caused confusion.” If the writer intended a full independent sentence, revise the clause rather than adding a comma alone.

Use the concept in a question

A dependent clause has a subject and verb but cannot stand alone because a subordinating word leaves the thought incomplete: “Although the class reviewed the rule.” Connect it to an independent clause—“Although the class reviewed the rule, several questions remained”—or remove the subordinating word if the clause is intended as a statement. A fragment may also be a phrase without a subject or finite verb. In editing, identify the clause boundary and ask whether each sentence unit expresses a complete thought. A period after a dependent clause does not make it independent. Punctuation should reflect the grammatical relationship rather than disguise an incomplete sentence.