Definition · Plain-language
Simple sentences
A simple sentence contains exactly one independent clause — a subject and a predicate — and expresses a complete thought, even if expanded with phrases.
The step most authors miss
Doing CRediT right? Don’t stop at the statement.
A CRediT statement credits you inside one paper. The recognition CRediT was built for happens when those roles are tied to you, persistently. Sign in with your ORCID — free — and claim your CRediT contributions on casrai.org, the home of the standard. They become a verified, portable part of your identity, not a line that disappears into one PDF.
Free: claim your contributions, then export a journal-ready CRediT statement, schema.org structured data, JATS XML, CSV or BibTeX — and preview your public profile. A membership publishes that profile publicly and verifies the journals you serve.
What makes a sentence simple
A simple sentence has one independent clause. That means it has one subject and one main predicate, and it can stand alone as a complete thought. Adding adjectives, adverbs, prepositional phrases and other modifiers does not change this fundamental structure: "The international research team presented its preliminary findings at the annual conference in Vienna" is still a simple sentence because it has one subject (team) and one predicate (presented), however many phrases decorate it. What would make it compound or complex is the addition of another clause — a group of words with its own subject and verb. Recognising the single clause is the test: strip away all modifiers, and you should find one subject–verb pair.
Structural patterns of simple sentences
English grammarians describe simple sentences by the elements that follow the verb, giving four core patterns. S+V (subject + verb): "Birds migrate." S+V+O (subject + verb + object): "The committee approved the budget." S+V+C (subject + verb + complement): "The findings were surprising." S+V+A (subject + verb + adverbial): "The conference takes place annually." Compound subjects and compound predicates expand the patterns without adding a new clause: "The editor and the author reviewed and revised the manuscript" is still a simple sentence — two subjects and two verbs, but one clause. Understanding these patterns helps writers identify when they have accidentally written a fragment or run-on.
Simple sentences in writing style
Simple sentences are powerful stylistic tools, not signs of unsophisticated writing. Short, direct simple sentences signal emphasis: "The hypothesis was wrong." They break up longer, more complex constructions, giving readers a moment to absorb an important point. Many plain-language and scientific-writing guides recommend using simple sentences for key claims, topic sentences and conclusions — places where clarity matters most. Problems arise when every sentence is simple and short, creating a choppy, fragmented rhythm. Balance simple sentences with compound and complex ones to create readable, flowing prose. In academic writing, a deliberate short simple sentence after a long complex explanation can act as a summary or punch line.
Key facts
At a glance
- Definition: one independent clause — one subject and one predicate
- Key patterns: S+V, S+V+O, S+V+C, S+V+A
- Not determined by length: a simple sentence can be very long if it has only one clause
- Compound subject: two or more subjects sharing one predicate — still simple
- Compound predicate: two or more predicates sharing one subject — still simple
- Writing role: signals emphasis, adds variety, aids clarity in key positions
- Test: remove all modifiers; if one subject–verb pair remains, the sentence is simple
Common misconceptions
What people often get wrong
Often heard: A simple sentence must be short.
Actually: "Simple" refers to clause structure, not length. A simple sentence can be many words long if it contains only one independent clause, with multiple modifying phrases attached to that single subject–verb pair.
Often heard: A sentence with two verbs cannot be simple.
Actually: A compound predicate — two verbs sharing the same subject — is still part of one clause: "She researched and wrote the report" is a simple sentence. Only if each verb has its own subject does the sentence become compound or complex.
Often heard: Simple sentences are only for beginners or informal writing.
Actually: Skilled writers use simple sentences deliberately for emphasis, clarity and rhythm. Many effective academic topic sentences and conclusions are grammatically simple. Short, direct simple sentences can be the most powerful in a paragraph.
Common questions
FAQ
What is a simple sentence?+
A simple sentence is one that contains exactly one independent clause — a group of words with a subject and a predicate that can stand alone as a complete thought. It may include phrases, compound subjects or compound predicates, but it has only one clause. Examples: "She writes." "The team submitted the report." "The results were clear and reproducible."
How is a simple sentence different from a compound or complex sentence?+
A simple sentence has one independent clause. A compound sentence has two or more independent clauses joined by a coordinating conjunction or semicolon. A complex sentence has one independent clause and at least one dependent clause introduced by a subordinating conjunction. The number and type of clauses define the category, not the length of the sentence.
Can a simple sentence have a compound subject?+
Yes. A compound subject consists of two or more nouns or pronouns sharing a predicate: "The editor and the author reviewed the manuscript" has a compound subject (editor and author) but only one predicate (reviewed), so it remains a simple sentence. Adding a second predicate to a different subject would make it compound or complex.
Going deeper
