GCSE English
GCSE English
Complete Sentences: GCSE English Grammar Guide with Examples
Complete Sentence: Definition, Types, and Examples
A complete sentence has a subject, a verb, and expresses a complete thought. Every English sentence belongs to one of 4 types by purpose (declarative, interrogative, imperative, exclamatory) and one of 4 types by structure (simple, compound, complex, compound-complex). Master both sets and you have the full picture - for exams and for life.
What Is a Complete Sentence?
A complete sentence contains a subject, a predicate (verb), and a complete thought. Three elements - nothing more, nothing less.
| Element | What it does | Example |
|---|---|---|
| Subject | Names who or what the sentence is about | Ali |
| Predicate (Verb) | Says what the subject does or is | studies every night |
| Complete thought | The sentence makes sense on its own | Ali studies every night. |
Miss any one of these and you have a sentence fragment - not a complete sentence.
Examples of Complete Sentences vs. Sentence Fragments
| Fragment | Complete Sentence |
|---|---|
| Running to school. | She is running to school. |
| Because the exam was hard. | Because the exam was hard, he studied all night. |
| The tall boy with the red bag. | The tall boy with the red bag forgot his pencil. |
| After the match ended. | After the match ended, the team celebrated. |
| Very tired and hungry. | The students were very tired and hungry. |
A sentence fragment looks like a sentence but fails at least one of the three tests. Add the missing element, or attach the fragment to a nearby sentence.
The 4 Types of Sentences (By Purpose)
Every sentence does a job. There are exactly 4 types of sentences by purpose.
| Type | Purpose | End Punctuation | Example |
|---|---|---|---|
| Declarative | Makes a statement | Period ( . ) | Pakistan won the match. |
| Interrogative | Asks a question | Question mark ( ? ) | Did Pakistan win the match? |
| Imperative | Gives a command or request | Period or ( ! ) | Watch the match tonight. |
| Exclamatory | Expresses strong emotion | Exclamation mark ( ! ) | Pakistan won the match! |
Declarative Sentences - Rules and Examples
A declarative sentence makes a statement. It ends with a period.
Structure: Subject + Verb + (rest of sentence) + period.
It can be positive (He passed.) or negative (He did not pass.).
3 Examples
- The sun rises in the east.
- Ali scored the highest marks in the class.
- MDCAT runs once a year.
Interrogative Sentences - Rules and Examples
An interrogative sentence asks a question. It ends with a question mark.
Two types:
- Yes/No questions - Did you study?
- Wh- questions - What is the capital of Pakistan?
The verb comes before the subject - that's what makes it a question.
3 Examples
- Are you ready for the exam?
- What time does the school bus arrive?
- How did she solve that equation?
Imperative Sentences - Rules and Examples
An imperative sentence gives a command or request. Writers leave out the subject (you) - it is understood.
Students often mistake imperatives for fragments. They are not. Sit down is complete. You is the understood subject.
3 Examples
- Open your books to page 45.
- Please submit your assignment before Friday.
- Do not use your phone during the exam.
Calm commands end with a period. Urgent ones end with an exclamation mark (Stop!).
Exclamatory Sentences - Rules and Examples
An exclamatory sentence expresses strong emotion. It ends with an exclamation mark.
These often start with What or How. In formal writing, avoid them - one exclamation mark in an essay is already one too many.
3 Examples
- What a brilliant answer!
- How fast he runs!
- I can't believe we won!
The 4 Types of Sentences by Structure
Every sentence also has a structure, based on its clauses. An independent clause stands alone. A dependent clause cannot.
| Structure | Definition | Example |
|---|---|---|
| Simple | One independent clause | She studies every night. |
| Compound | Two or more independent clauses joined by a conjunction or semicolon | She studies every night, and she always passes. |
| Complex | One independent clause + one or more dependent clauses | She always passes because she studies every night. |
| Compound-Complex | Two or more independent clauses + at least one dependent clause | She studies every night, and she always passes because she is disciplined. |
Simple Sentences - Rules and Examples
A simple sentence has one independent clause.
It can have a compound subject (Ali and Sara) or compound verb (ran and jumped) - still simple, as long as there is one clause.
3 Examples
- The student passed the exam.
- Ali and Sara study together every evening.
- Karachi is the largest city in Pakistan.
Compound Sentences - Rules and Examples
A compound sentence joins two or more independent clauses with a coordinating conjunction or semicolon.
The coordinating conjunctions are FANBOYS:
- For
- And
- Nor
- But
- Or
- Yet
- So
Put a comma before the conjunction.
3 Examples
- She studied hard, and she passed the exam.
- I wanted to sleep, but I had to finish the assignment.
- The electricity went out; the students continued studying by candlelight.
Complex Sentences - Rules and Examples
A complex sentence has one independent clause and at least one dependent clause.
The dependent clause opens with a connecting word - because, although, when, if, since, while, unless, after, before, until.
If the dependent clause comes first, add a comma after it. If it comes second, no comma is needed.
3 Examples
- Although it was raining, the match continued.
- She scored full marks because she practised every day.
- The whole class cheered when the results came out.
Compound-Complex Sentences - Rules and Examples
A compound-complex sentence has two or more independent clauses AND at least one dependent clause.
Find the independent clauses first, then spot the connecting word that introduces the dependent clause.
3 Examples
- She studied all night because the exam was important, and she wanted to get into medical college.
- Although the questions were difficult, Ali attempted every one, and he still finished before time.
- If you manage your time well, your grades will improve, and you will feel less stressed.
Complete Sentence Checklist - How to Check Your Writing
Run every sentence through this checklist before you submit:
- Does it have a subject?
- Does it have a verb?
- Does it express a complete thought?
- Is the punctuation correct?
- Is it free of run-on errors?
What Is a Run-On Sentence?
Two clauses joined without punctuation make a run-on sentence. There are two types:
- Fused sentence - no punctuation at all: She studied hard she passed. → She studied hard, so she passed.
- Comma splice - only a comma, no conjunction: She studied hard, she passed. → She studied hard; she passed.
Three fixes: add a period | add a comma + FANBOYS conjunction | add a semicolon.
Common Mistakes Students Make
1. Writing sentence fragments - "Running to the exam hall." Add a subject: "He was running to the exam hall."
2. Writing run-on sentences - "The teacher entered the class became quiet." Fix: "The teacher entered, and the class became quiet."
3. Confusing imperatives with fragments - "Sit down." is complete. The subject you is implied.
4. Overusing emotion sentences - Save them for creative writing. Avoid them in essays.
5. Getting complex sentences wrong - A dependent clause alone ("Because he was late.") is still a fragment. It needs an independent clause to complete it.
Practice Exercises
Part A - Identify the sentence type (by purpose)
- The biology exam is on Thursday.
- What chapter should I study first?
- Please bring your admit card to the exam hall.
Part B - Fix the fragment
- Although the results were delayed.
- Running fast and breathing hard.
Part C - Label the structure
- She wanted to become a doctor, but she also loved engineering, so she appeared in both MDCAT and ECAT.
Answers
- Declarative - statement, ends with a period.
- Interrogative - question, ends with a question mark.
- Imperative - polite command; you is implied.
- Although the results were delayed, the students remained calm.
- He was running fast and breathing hard.
- Compound-Complex - two independent clauses joined by but, plus a dependent clause introduced by so.
Want more practice? Search for a 4 types of sentences worksheet on K12Reader or Education.com - both offer free printable exercises with answers.