Clauses
What you'll learn
- Distinguish a clause from a phrase
- Identify independent (main) and dependent (subordinate) clauses
- Name and use the three types of subordinate clauses
- Classify sentences as simple, compound, complex, or compound-complex
Key concepts
Clause vs Phrase
| Feature | Clause | Phrase |
|---|---|---|
| Has a subject? | Yes | Not necessarily |
| Has a finite verb? | Yes | No |
| Can stand alone (sometimes)? | Yes (independent) / No (dependent) | Never |
| Example | "She sings beautifully." | "with great skill" |
Key rule: Every clause has both a subject and a finite verb. A phrase is a group of words that acts as a single part of speech but lacks one or both of these.
Independent Clauses
An independent clause can stand alone as a complete sentence. It expresses a complete thought.
Examples:
- "The dog barked loudly." — complete ✓
- "She finished her homework." — complete ✓
Dependent (Subordinate) Clauses
A dependent clause has a subject and verb but cannot stand alone — it needs a main clause to be complete. It begins with a subordinating conjunction or relative pronoun.
Common subordinating conjunctions: because, although, since, when, while, if, unless, after, before, until, as
Examples:
- "Because she was tired…" — incomplete on its own ✗
- "Although it was raining…" — incomplete on its own ✗
These become complete when joined to a main clause:
- "She went to sleep because she was tired." ✓
The Three Types of Subordinate Clauses
1. Noun Clause
Acts as a noun. Can function as subject, object, or complement.
| Function | Example |
|---|---|
| Subject | What she said surprised everyone. |
| Object | I know that he is honest. |
| Complement | The problem is that nobody listened. |
Signal words: that, what, whether, who, how, why, when (as conjunctions)
2. Adjective Clause (Relative Clause)
Acts as an adjective. Describes or modifies a noun. Introduced by a relative pronoun.
Relative pronouns: who (person, subject), whom (person, object), whose (possession), which (thing), that (person or thing)
Examples:
- "The girl who won the prize is my friend." → describes "girl"
- "The book that I borrowed was interesting." → describes "book"
Defining vs Non-defining:
- Defining: "The man who spoke is the principal." (tells WHICH man — no commas)
- Non-defining: "Mr. Sharma, who has been here for 20 years, is retiring." (extra info — use commas)
3. Adverb Clause
Acts as an adverb. Modifies a verb, adjective, or adverb. Tells when, where, why, how, to what extent.
| Type | Conjunction | Example |
|---|---|---|
| Time | when, while, after, before | She called after I left. |
| Reason | because, since, as | He failed because he didn't study. |
| Condition | if, unless, provided that | If it rains, we'll cancel. |
| Contrast | although, even though, while | Although he tried hard, he didn't win. |
| Purpose | so that, in order that | Speak clearly so that everyone understands. |
Types of Sentences Based on Clauses
| Sentence Type | Structure | Example |
|---|---|---|
| Simple | 1 independent clause | "Birds fly." |
| Compound | 2+ independent clauses joined by coordinating conjunction (for/and/nor/but/or/yet/so = FANBOYS) | "She ran, but she missed the bus." |
| Complex | 1 independent + 1 or more subordinate clauses | "She ran because she was late." |
| Compound-Complex | 2+ independent + 1 or more subordinate clauses | "She ran but she was late, although she had tried her best." |
Memory tip for coordinating conjunctions: FANBOYS — For, And, Nor, But, Or, Yet, So.
Worked Identification Example
"Although the weather was bad, the team played well and won the trophy."
- "Although the weather was bad" → dependent adverb clause (contrast)
- "the team played well" → independent clause
- "won the trophy" → part of the same independent clause (compound verb)
- Sentence type: Complex (1 independent + 1 dependent)
Quick check
- Is "running down the street" a clause or a phrase? Why?
- Identify the type of subordinate clause: "I don't know where she went."
- What relative pronoun do you use for a person as an object (e.g., "The teacher _____ I respect")?
- Join these two independent clauses using an appropriate coordinating conjunction: "She studied hard." "She passed the exam."
- Identify the sentence type: "He was tired, so he slept early, although he had more work to do."
Open the Practice tab for graded questions on Clauses and Phrases.
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