Complex Sentence: Definition, Uses, and Examples

20 Examples of Complex Sentences

• I stayed home because it was raining.
• When the teacher entered, everyone became quiet.
• She was happy because she passed the exam.
• Although it was late, he kept studying.
• I will call you after I reach home.
• Since you are here, let’s start the meeting.
• He didn’t come because he was sick.
• If you study hard, you will pass the test.
• I couldn’t sleep because the room was noisy.
• Before I went to bed, I brushed my teeth.
• She smiled when she saw her friend.
• While he was cooking, the phone rang.
• Even though it was raining, we went for a walk.
• I read a book because I wanted to learn more.
• Unless you hurry, we will miss the bus.
• Though he was tired, he finished his homework.
• As soon as I saw him, I waved my hand.
• She didn’t go out since it was very cold.
• Whenever I travel, I take lots of pictures.
• I will wait here until you come back.

Complex Sentence Exercise

Exercise 1: Identify the Subordinate Clause

1. I didn’t go because I was ill.
2. When the bell rings, students enter the class.
3. Although it was cold, we swam in the lake.

Answers:

1. because I was ill
2. When the bell rings
3. Although it was cold

Exercise 2: Combine the Sentences to Make Complex Sentences

1. She didn’t come. She was sick.
2. We will go out. The rain stops.
3. I called him. He didn’t answer.

Answers:

1. She didn’t come because she was sick.
2. We will go out when the rain stops.
3. I called him but he didn’t answer.

Complex Sentences Worksheet

Part A: Identify the Clauses

Instructions:
Read each sentence and underline the main clause and circle the subordinate clause.

1. I stayed home because I was tired.
2. When the sun rises, the birds start singing.
3. Although it was raining, we went out to play.
4. If you work hard, you will pass the test.
5. She smiled because she was happy.

Part B: Join the Sentences

Instructions:
Combine the two short sentences into one complex sentence using the given conjunctions.

No.	Sentences	Conjunction
1	I was late. I missed the train.	because
2	He didn’t study. He failed the exam.	since
3	We stayed inside. It was raining.	as
4	She went out. It was dark.	although
5	You call me. I will come.	if

Part C: Complete the Sentences

Instructions:
Fill in the blanks with a suitable subordinating conjunction (because, although, if, when, since).

1. I will visit you _______ I finish my homework.
2. _______ it was cold, they went swimming.
3. She was sad _______ she lost her bag.
4. _______ you study hard, you will get good grades.
5. I have known her _______ we were in school.

Part D: Rewrite the Sentences

Instructions:
Rewrite each simple sentence into a complex sentence by adding a dependent clause.

1. I opened the window.
2. She cried.
3. He ran fast.
4. They stayed at home.
5. I bought a new phone.

Example:
Simple: I opened the window.
Complex: I opened the window because it was hot.

Part E: Choose the Correct Option

Instructions:
Select the correct subordinating conjunction to complete each sentence.

1. I couldn’t sleep ___ it was noisy.
   a) and  b) because  c) but
2. ___ she was tired, she finished the work.
   a) Although  b) If  c) When
3. I will call you ___ I reach home.
   a) because  b) when  c) but
4. ___ you don’t hurry, we’ll miss the bus.
   a) Since  b) Unless  c) Because
5. We enjoyed the picnic ___ it rained a little.
   a) although  b) if  c) when

Answers Section

Part A Answers:

1. because I was tired
2. When the sun rises
3. Although it was raining
4. If you work hard
5. because she was happy

Part B Answers:

1. I missed the train because I was late.
2. He failed the exam since he didn’t study.
3. We stayed inside as it was raining.
4. She went out although it was dark.
5. I will come if you call me.

Part C Answers:

1. when
2. Although
3. because
4. If
5. since

Part D (Possible Answers):

1. I opened the window because it was hot.
2. She cried when she heard the bad news.
3. He ran fast so that he could catch the bus.
4. They stayed at home since it was raining.
5. I bought a new phone because my old one broke.

Part E Answers:

1. b) because
2. a) Although
3. b) when
4. b) Unless
5. a) although

FAQs about Complex Sentences

What is a complex sentence with an example?
A complex sentence is a sentence that has one independent clause and one or more dependent clauses. The dependent clause gives extra information and is joined by a subordinating conjunction such as because, although, when, since, or if.
Example: I stayed home because it was raining.

How do you form a complex sentence?
You form a complex sentence by joining a main clause and a dependent clause with a subordinating conjunction.
Example: I stayed home because it was raining.

What is the difference between a compound and complex sentence?
A compound sentence joins two independent clauses using and, but, or, so.
A complex sentence joins one independent clause and one dependent clause using because, although, if, or when.

Why are complex sentences important in writing?
Complex sentences make writing clearer and more detailed. They help show cause, time, contrast, or condition, making your ideas flow smoothly and naturally.

What are some common subordinating conjunctions used in complex sentences?
Common subordinating conjunctions include because, although, since, if, when, while, after, before, unless, and though.
Example: Although it was cold, we went outside.

Read More

• Declarative Sentence
• Compound Sentence
• Imperative Sentence