"Then" is not a conjunction. It is an adverb that indicates sequence, timing, or consequence in a sentence. Conjunctions join words, phrases, or clauses; "then" does not perform this function.
True conjunctions include "and," "but," "or," "so," "yet," and "for." These connect elements directly. "Then" does not join clauses-it modifies them. For example, in "She finished her work, then left," "then" shows order but doesn't link the clauses as a conjunction would.
Confusing "then" with a conjunction leads to errors in punctuation and logic. Misplaced or misused "then" can make sentences ambiguous or incorrect. Understanding its actual role prevents common mistakes in both spoken and written English.
"Then" acts as an adverb of time or sequence. It signals what happens next in a timeline or logical progression. It often appears after a clause or action to indicate the next step.
Consider: "He turned off the lights, then walked out the door." Here, "then" introduces the second action. It does not connect the two clauses-it merely marks their order. A conjunction like "and" would link them: "He turned off the lights and walked out."
When "then" appears at the start of a sentence, it still functions as an adverb. In "Then she realized the mistake," "then" sets up the timing of her realization. It's not joining two independent clauses, which would require a coordinating conjunction.
"Then" derives from Old English "þæn," meaning "at that time." Its root is temporal, not relational. This historical origin confirms its role as a time marker, not a connector.
As an adverb, "then" modifies verbs, adjectives, or entire clauses. It answers questions like "when?" or "next?" rather than linking ideas. Compare:
Using "then" as a conjunction violates standard grammar rules. The sentence "She studied hard, then passed the test" is correct-but only because "then" is modifying the action, not joining the clauses. To join them properly, use "and" or "so."
Many writers mistakenly treat "then" as a conjunction, especially in informal writing. This error appears in phrases like "I did my homework, then I watched TV," where "then" is used to imply a causal or sequential link between actions.
Correct usage requires understanding that "then" cannot replace a coordinating conjunction. If you want to join two independent clauses, use "and," "but," "or," "so," "yet," or "for." For example:
Incorrect: She missed the bus, then arrived late.
Correct: She missed the bus, and she arrived late.
Some style guides, including the Chicago Manual of Style, discourage using "then" to join clauses in formal writing. It may appear in narrative prose for flow, but it lacks grammatical function as a connector.
A non-obvious distinction: "Then" can follow a prepositional phrase. In "After dinner, then we left," "then" still functions as an adverb. The preposition "after" sets the time frame; "then" adds the next event. This shows that "then" doesn't depend on being attached to a clause-it stands independently.
Let's analyze a real-world sentence: "The meeting ended at 5 p.m., then everyone went home."
Breakdown:
Because "then" is not a conjunction, the sentence lacks a proper connecting word. To fix it, use a coordinating conjunction:
Revised: "The meeting ended at 5 p.m., and everyone went home."
This version uses "and" to join two independent clauses correctly. "Then" remains acceptable in narrative contexts for pacing, but it fails as a grammatical connector.
Another example: "He called his mother, then he went to sleep." This sentence is structurally sound because "then" marks sequence, not connection. But if you rewrite it as "He called his mother, then he went to sleep" with a semicolon, it becomes a compound sentence with a coordinating conjunction missing. The correct form is:
He called his mother; then he went to sleep.
Here, "then" serves as a transitional adverb after a semicolon, which is acceptable in formal writing. But it still isn't a conjunction.
| Feature | True Conjunction (e.g., "and") | "Then" (Adverb) |
|---|---|---|
| Function | Joins words, phrases, or clauses | Indicates time or sequence |
| Position | Between connected elements | At start or end of clause |
| Example | "She ran and jumped." | "She ran, then jumped." |
| Grammatical Role | Coordinating conjunction | Adverb of time |
As shown, "then" cannot fulfill the structural role of a conjunction. It does not create a compound sentence. It only adds temporal clarity.
In my experience teaching English composition, students frequently misuse "then" in place of "and" or "so." One student wrote: "I forgot my keys, then I couldn't enter the building." The intended meaning was causal, but "then" only shows sequence. The corrected version: "I forgot my keys, so I couldn't enter the building."
This error persists because "then" sounds like a connector. It's used in storytelling and dialogue to mark transitions. But in formal writing, it must not substitute for a proper conjunction.
Understanding "then" as an adverb helps clarify other parts of speech. For example, "there are conjunction" refers to words like "and" and "but" that join clauses. These are distinct from adverbs like "then" or "however."
Knowing that "then" is not a conjunction improves clarity in writing. It ensures accurate punctuation, proper sentence structure, and stronger communication.