Sentence Structure and Clauses

Grade 7 · English · Study Guide

Master the building blocks of sentences — learn the difference between independent and dependent clauses, and how to construct simple, compound, complex, and compound-complex sentences.

Understanding sentence structure is like learning the architecture of language. Once you understand how sentences are built, you can write with more variety, precision, and power. Every sentence — no matter how long or short — is built from clauses.

A clause is a group of words that contains a subject and a verb. An independent clause expresses a complete thought and can stand alone as a sentence: 'She finished her homework.' A dependent clause also has a subject and verb, but it cannot stand alone — it depends on an independent clause to make sense: 'Because she studied hard' needs more information to be complete.

These two types of clauses combine to create the four sentence types. A simple sentence has one independent clause: 'The dog barked.' A compound sentence has two or more independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, so — remember FANBOYS) or a semicolon: 'The dog barked, and the cat ran away.' A complex sentence has one independent clause and at least one dependent clause: 'Although it was raining, we played outside.' A compound-complex sentence has two or more independent clauses and at least one dependent clause: 'Although it was raining, we played outside, and we had a great time.'

Variety in sentence structure makes writing engaging. Using only simple sentences feels choppy and childish. Using only long compound-complex sentences exhausts the reader. Great writers mix all four types — short punchy sentences for impact, longer ones for detail and flow. Sentence fragments (incomplete thoughts) and run-on sentences (two independent clauses improperly joined) are common errors that weaken writing.

The Four Sentence Types
Type	Structure	Example
Simple	1 independent clause	She reads every night.
Compound	2+ independent clauses + conjunction/semicolon	She reads every night, and she takes notes.
Complex	1 independent + 1+ dependent clause	Because she reads every night, she writes well.
Compound-complex	2+ independent + 1+ dependent clause	Because she reads, she writes well, and her grades improved.

Key terms

Clause: A group of words with a subject and a verb
Independent clause: A clause that expresses a complete thought and can stand alone
Dependent clause: A clause that cannot stand alone — it needs an independent clause
Simple sentence: One independent clause
Compound sentence: Two or more independent clauses joined by a conjunction or semicolon
Complex sentence: One independent clause and at least one dependent clause
FANBOYS: Coordinating conjunctions: For, And, Nor, But, Or, Yet, So
Run-on sentence: Two independent clauses improperly joined without punctuation or a conjunction
Sentence fragment: An incomplete sentence missing a subject, verb, or complete thought

Flashcards

Independent clause: Has a subject and verb; expresses a complete thought — can stand alone
Dependent clause: Has a subject and verb but cannot stand alone — 'Because she studied'
FANBOYS: Coordinating conjunctions: For, And, Nor, But, Or, Yet, So
Complex sentence: One independent clause + one or more dependent clauses
Run-on sentence: Two independent clauses fused without proper punctuation or conjunction
Sentence fragment: An incomplete sentence missing a subject, verb, or complete thought

Practice questions

Which sentence is a compound sentence?
1. She ran to school.
2. Because she was late, she ran.
3. She was late, so she ran.
4. Running to school, she was late.
Show answer
Answer: She was late, so she ran.
Two independent clauses ('She was late' + 'she ran') joined by the coordinating conjunction 'so' = compound sentence.
A clause that cannot stand alone as a complete sentence is called a ___ clause.
Show answer
Answer: dependent
A dependent clause has a subject and verb but starts with a subordinating conjunction (because, although, when) that makes it incomplete alone.
A simple sentence can have more than one subject or more than one verb.
Show answer
Answer: True
A simple sentence has ONE independent clause but can have compound subjects ('John and Mary ran') or compound verbs ('She ran and jumped').
In the sentence 'Although it was cold, we went swimming,' the dependent clause is:
1. We went swimming
2. Although it was cold
3. It was cold
4. We went
Show answer
Answer: Although it was cold
'Although' is a subordinating conjunction — it introduces the dependent clause, which can't stand alone as a sentence.
Which mnemonic helps remember the seven coordinating conjunctions?
1. HOMES
2. FANBOYS
3. SWABI
4. AAAWWUBBIS
Show answer
Answer: FANBOYS
FANBOYS = For, And, Nor, But, Or, Yet, So — the seven coordinating conjunctions used to join independent clauses in compound sentences.

Fun facts

Ernest Hemingway was famous for short, punchy simple sentences. William Faulkner once wrote a sentence that lasted an entire page. Both approaches can be powerful — it's all about purpose.
The world's longest published sentence appears in William Faulkner's 'Absalom, Absalom!' — it runs 1,288 words.

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