Simple sentences
A simple sentence is a sentence with only one independent clause, meaning it contains a single subject and a single predicate (verb) that together express one complete thought. It has no subordinate (dependent) clauses. For example: "The children played in the park." It stands alone grammatically and makes complete sense.
Types of simple sentences
Single subject and verb
The most basic form, with one subject performing one action.
e.g. She smiled., The dog barked loudly.
Compound subject
Two or more subjects joined by 'and' or 'or' share the same single verb.
e.g. Tom and Jerry laughed., Rain or snow is expected.
Compound verb (predicate)
One subject performs two or more actions joined by 'and' or 'or', but the sentence still counts as one clause.
e.g. He cooked dinner and washed the dishes., She sang and danced on stage.
Sentence with modifiers
Extra words such as adjectives, adverbs or prepositional phrases add detail but do not create a new clause.
e.g. The old man walked slowly along the beach., They arrived early in the morning.
Rules to remember
- A simple sentence must contain exactly one independent clause: one subject and one finite verb expressing a complete idea.
- It cannot contain a subordinating conjunction (such as 'because', 'although', 'when') that would create a dependent clause.
- It can still include compound subjects, compound verbs, objects, and modifying phrases without becoming a compound or complex sentence.
- Coordinating conjunctions like 'and' or 'or' may join words or phrases within a simple sentence, but if they join two full clauses with their own subject and verb, the sentence becomes compound.
- Every simple sentence must end with correct punctuation (usually a full stop, question mark or exclamation mark) and express a complete thought.
Examples in sentences
| Example | How it works |
|---|---|
| Birds fly. | The shortest possible simple sentence: one subject, one verb. |
| My sister studies medicine in London. | One subject and verb with added detail from modifiers, still one clause. |
| The manager and her assistant reviewed the report. | A compound subject sharing a single verb keeps this a simple sentence. |
| He opened the window and turned on the fan. | A compound verb with one subject; still only one independent clause. |
| Success requires patience. | A concise simple sentence expressing one complete idea. |
| Please close the door. | An imperative sentence with an understood subject 'you', still a simple sentence. |
Common mistakes
Incorrect: The weather was cold, we stayed inside.
Correct: The weather was cold, so we stayed inside. (or split into two simple sentences with a full stop)
Incorrect: Because it was raining.
Correct: It was raining. (remove 'because' to keep it as a complete simple sentence, or add an independent clause: 'Because it was raining, we stayed home.')
Incorrect: She loves reading, she visits the library every week.
Correct: She loves reading. She visits the library every week. (two separate simple sentences, avoiding a comma splice)
Why this matters for IELTS
In IELTS Writing and Speaking, accurate simple sentences show you can express ideas clearly and correctly before attempting more complex grammar. Examiners reward a mix of sentence types under Grammatical Range and Accuracy, so using well-formed simple sentences alongside compound and complex ones, without comma splices or run-ons, demonstrates control and helps you avoid errors that lower your accuracy score.
Frequently asked questions
What is a simple sentence in one line?
A simple sentence is a sentence with exactly one independent clause: one subject and one verb expressing a complete thought, with no dependent clauses.
Can a simple sentence have more than one subject or verb?
Yes, it can have a compound subject or compound verb, as long as everything still belongs to a single independent clause with no subordinate clause.
How is a simple sentence different from a compound sentence?
A simple sentence has one independent clause, while a compound sentence joins two or more independent clauses using a coordinating conjunction, semicolon, or comma with a conjunction.
Put your grammar to the test
Take a free IELTS practice test and get instant band scores with expert feedback.
Try a free Writing test