Conjunctions and Complex Sentences

A Today you'll learn

Differentiate coordinating conjunctions (FANBOYS) and subordinating conjunctions (because, although, if, unless, while).
Distinguish an independent clause from a dependent (subordinate) clause.
Combine clauses correctly with appropriate comma placement to form complex sentences.

B Let's understand

A clause is a group of words containing a subject and a predicate. An Independent Clause expresses a complete thought and can stand alone as a sentence (e.g., "We stayed inside"). A Dependent (or Subordinate) Clause cannot stand alone and depends on an independent clause for full meaning (e.g., "because it was raining heavily"). A Complex Sentence consists of one independent clause combined with at least one dependent clause joined by a subordinating conjunction (such as because, although, since, unless, while, if, after, before). When the dependent clause starts the sentence, a comma must follow it (e.g., "Although it was raining, we went for a walk."). When the independent clause comes first, no comma is typically needed.

C See it step by step

Example 1: Combine into a complex sentence using "although": "The trek was steep and tiring." "The hikers reached the summit with big smiles."

Step 1: "The trek was steep and tiring" shows contrast. Add subordinating conjunction "Although".
Step 2: Place dependent clause first: "Although the trek was steep and tiring,".
Step 3: Add comma, then independent clause: "the hikers reached the summit with big smiles."

Example 2: Identify the independent and dependent clause: "You will not pass the swimming test unless you practise every day."

Step 1: "You will not pass the swimming test" expresses a complete thought = Independent clause.
Step 2: "unless you practise every day" begins with conjunction "unless" and cannot stand alone = Dependent clause.

D Your turn

Which word in this sentence is a subordinating conjunction? "Although it was freezing, they played soccer."

Look back at "Let's understand" above for a clue.

E Ready to practise?

Key idea 1

An independent clause expresses a complete idea; a dependent clause cannot stand alone.

Subordinating conjunctions include because

Subordinating conjunctions include because, although, since, unless, if, while, after.

Key idea 3

A complex sentence connects an independent clause with one or more dependent clauses.

Key idea 4

If the dependent clause begins the sentence, place a comma after it.

Coordinating conjunctions (for

Coordinating conjunctions (for, and, nor, but, or, yet, so) form compound sentences.

Warm up

1. Identify the subordinating conjunction: "We stayed indoors because the storm was severe."

2. Is this an independent or dependent clause? "Since she had prepared thoroughly for the exam"

3. Combine using "unless": "You will miss the school bus." "You leave right now."

Practise

4. Combine using "while": "Grandmother knitted a woollen scarf." "The children listened to music."

5. Insert the missing comma: "Although he was exhausted the runner finished the marathon."

6. Fill in the blank with an appropriate conjunction: "We will play outside ________ it stops raining."

Challenge

7. Explain the difference between a compound sentence and a complex sentence in one sentence.

8. Write an original complex sentence beginning with "Because".

Download worksheet (PDF)

Question 1: Identify the subordinating conjunction: "We stayed indoors because the storm was severe."

Answer: because

Question 2: Is this an independent or dependent clause? "Since she had prepared thoroughly for the exam"

Answer: Dependent clause (incomplete thought)

Question 3: Combine using "unless": "You will miss the school bus." "You leave right now."

Answer: You will miss the school bus unless you leave right now. (or: Unless you leave right now, you will miss the school bus.)

Question 4: Combine using "while": "Grandmother knitted a woollen scarf." "The children listened to music."

Answer: Grandmother knitted a woollen scarf while the children listened to music.

Question 5: Insert the missing comma: "Although he was exhausted the runner finished the marathon."

Answer: Although he was exhausted, the runner finished the marathon.

Question 6: Fill in the blank with an appropriate conjunction: "We will play outside ________ it stops raining."

Answer: if (or once / as soon as / when)

Question 7: Explain the difference between a compound sentence and a complex sentence in one sentence.

Answer: A compound sentence joins two independent clauses with a coordinating conjunction, while a complex sentence joins an independent clause with a dependent clause

Question 8: Write an original complex sentence beginning with "Because".

Answer: Sample answer: Because the library was quiet and peaceful, Priya finished her book in one afternoon.