Can You Start a Sentence With “But”? Rules and Examples
Can You Start a Sentence With “But”? Rules and Examples
Short answer: yes. You can start a sentence with “But”. It is grammatically correct, professional writers do it all the time, and no major style guide forbids it. The belief that you cannot is one of the most persistent myths in English grammar.
Why Do People Think It Is Wrong?
Most people learned this “rule” in school. Teachers often told young students never to start a sentence with and or but — not because it is ungrammatical, but because children tend to write sentence fragments like this:
“But really fast.”
That is not a complete sentence. It has no subject performing an action, so it fails as a sentence — with or without the word “But.” Teachers simplified the lesson into a blanket ban, and the ban stayed in many students’ minds long after school.
The real rule was never about the word. It was about writing complete sentences.
What Do Grammar Experts and Style Guides Say?
Major style guides allow it. The Chicago Manual of Style states there is no rule against starting a sentence with a conjunction. Merriam-Webster notes that writers have started sentences with “but” for centuries, including in respected literature. The AP Stylebook likewise does not prohibit it.
“But” is a coordinating conjunction — one of the FANBOYS words (for, and, nor, but, or, yet, so). Coordinating conjunctions usually join two clauses inside one sentence, but they can also open a new sentence to create a pause and add emphasis.
Starting a Sentence With “But” vs. Joining With a Comma
Both of these are correct. They simply feel different:
- Joined: “The plan was simple, but nobody had tried it before.”
- Separate: “The plan was simple. But nobody had tried it before.”
The joined version flows smoothly. The separate version stops, resets, and makes the contrast hit harder. Choosing between them is a matter of rhythm and emphasis, not correctness.
When Starting With “But” Works Well
- For emphasis. It spotlights the contrast: “He had every advantage. But he still lost.”
- For flow in long writing. After several long sentences, a short “But…” sentence changes the pace and keeps readers awake.
- In dialogue and informal writing. People speak this way naturally, so it sounds human in stories, blogs, and scripts.
- To correct an assumption. “You might expect the sequel to be worse. But it is actually better than the original.”
When Should You Avoid It?
- Overuse. If every third sentence starts with “But,” the effect dies and the writing looks sloppy. Use it occasionally, on purpose.
- Very formal documents. In legal contracts, academic papers following strict guidelines, or formal business reports, some readers still expect the old rule. The grammar is fine, but audience expectations matter — a “However,” at the start may be the safer choice there.
- Fragments. Never let a “But…” opening stand as a fragment. It still needs a subject and a verb: “But she won” is a sentence; “But very quickly” is not.
“But” vs. “However” at the Start of a Sentence
- “But the results surprised everyone.” — light, conversational, strong contrast.
- “However, the results surprised everyone.” — more formal; note the comma after “However.”
Both are correct. “But” is shorter and punchier; “However” sounds more formal. Many strong writers use both, depending on tone.
Quick Rules to Remember
- Starting a sentence with “But” is grammatically correct.
- The sentence after “But” must still be complete — subject plus verb.
- Use it for contrast and emphasis, not as a habit.
- In strict formal writing, consider “However” instead.
- Do not follow “But” with a comma in normal use (“But the…” not “But, the…”).
FAQs
Is it grammatically correct to start a sentence with “But”?
Yes. It has been accepted in English writing for centuries and is allowed by major style guides.
Can you start a sentence with “And” too?
Yes — the same principle applies. A complete sentence that begins with “And” is correct, though it should also be used sparingly.
Why did my teacher say it was wrong?
Most likely to prevent sentence fragments while you were learning to write. It was a teaching shortcut, not a real grammar rule.
Is starting a sentence with “But” okay in an essay?
In most school and college essays, yes. If your teacher or institution follows a strict style policy against it, follow their policy for that assignment.
The Bottom Line
You can start a sentence with “But” — confidently and correctly. Just make sure the sentence is complete, save the trick for moments where the contrast matters, and match the formality of your audience. Rules built on myths should not limit good writing.
