Clause is a group of words that contains both a Subject and a Verb.
The 2 Main Types of Clauses
1. Independent (Main) Clause
It has a subject, a verb, and it makes complete, perfect sense all by itself. An independent clause is basically a simple sentence.
Example: The sun was shining. (Subject = sun, Verb = was shining. Makes complete sense).
Example: I ate an apple.
2. Dependent (Subordinate) Clause
It has a subject and a verb, but it cannot stand alone. It leaves you hanging, waiting for more information. It always starts with a subordinating word (like because, if, when, who, that, since).
Example: Because the sun was shining... (Subject = sun, Verb = was shining.
Example: ...when I ate an apple.
We went to the beach (Independent) because the sun was shining (Dependent).
Deep Dive into Dependent Clauses
Just like phrases, dependent clauses take on specific jobs.
1. Noun Clause
The entire clause acts as a Noun. It answers the question "What?". It usually starts with that, what, whatever, who, whom, how, why.
Example: I know that he is an honest man. (I know what?)
Example: What you said made me angry. (What made me angry?)
2. Adjective (Relative) Clause
The entire clause acts as an Adjective describing a noun. It mostly comes exactly after the noun it describes and starts with who, whom, whose, which, that.
Example: The umbrella which has a broken handle is mine. (Describes the umbrella).
Example: I know the boy who won the race. (Describes the boy).
3. Adverb Clause
The entire clause acts as an Adverb, modifying the main verb. It tells us the condition, reason, time, or place of the action.
Time: I will call you when I reach home.
Reason/Cause: He failed because he did not study.
Condition: You will pass if you work hard.
Place: You can sit wherever you like.
Concession (Contrast): Although he was sick, he came to school.
Part 4: The "Phrase vs. Clause"
Some Other Clauses
1. Coordinate Clauses
When you join two Independent Clauses using a Coordinating Conjunction (the FANBOYS: For, And, Nor, But, Or, Yet, So), both sides are equal in power. We call these Coordinate Clauses.
The Rule: Neither side depends on the other. If you remove the conjunction, you are left with two perfect, complete sentences.
Example: [I wanted to play football] but [it started raining].
Clause 1: I wanted to play football. (Independent)
Clause 2: It started raining. (Independent)
Result: They are coordinate clauses forming a compound sentence.
2. Defining vs. Non-Defining Clauses (Comma Trap)
We already learnt about adjective (relative) clauses, which start with words like 'who', 'which', or 'that'. But these are actually split into two very different types.
A. Defining (Restrictive) Relative Clauses
This clause gives essential information. If you remove it, you don't know who or what the sentence is talking about.
The Rule: NEVER use commas.
Example: The doctor who treated my grandfather is very famous.
(If you remove the bold clause, it says "The doctor is very famous." Which doctor?)We don't know! The clause is essential).
B. Non-Defining (Non-Restrictive) Relative Clauses
This clause gives extra, bonus information. The sentence already makes perfect sense without it.
The Rule: You MUST put commas around it. It acts like a grammatical parenthesis.
Example: My grandfather, who is 80 years old, still plays tennis.
(If you remove the bold clause, it says "My grandfather still plays tennis." We already know exactly who the subject is. The age is just extra info).
3. Conditional Clauses (“If” Family)
They always talk about a condition and a result.
Level 1: The Real/Possible Condition (First Conditional)
Used for things that have a real chance of happening in the future.
Formula: If + Simple Present | Will + Base Verb
Example: If you study hard, you will pass the exam.
Level 2: The Imaginary Condition (Second Conditional)
Used for dreaming about impossible or unlikely things right now. (Detailed in the "fake past" rule in tenses).
Formula: If + Simple Past | Would + Base Verb
Example: If I won the lottery, I would buy an island.
Level 3: The "Too Late" Condition (Third Conditional)
Used for regrets about the past. The event is already over, and you cannot change it.
Formula: If + Past Perfect (had + 3rd form) | Would have + 3rd form
Example: If you had woken up earlier, you would have caught the train.
4. Non-Finite Clauses (The Hidden Clauses)
A. Participle Clauses
They start with an -ing or -ed verb.
Standard: Because he felt tired, he went to bed early.
Participle Clause: Feeling tired, he went to bed early.
Standard: The man who was injured in the accident was taken to the hospital.
Participle Clause: Injured in the accident, the man was taken to the hospital.
B. Infinitive Clauses
These start with "to + verb" and are used to show purpose or reason.
Standard: I went to the market so that I could buy some milk.
Infinitive Clause: I went to the market to buy some milk.
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