Complex Sentences

English Grammar and Spoken English Tutorial

Lesson 23 of 23

1. What Is a Complex Sentence?

A complex sentence contains one independent clause and at least one dependent clause.

Hindi meaning: Complex sentence में एक मुख्य clause और कम-से-कम एक dependent clause होता है। Main clause अपने आप में पूरा अर्थ देता है, जबकि dependent clause मुख्य clause पर निर्भर करता है।
Example: I stayed at home because it was raining.
Main clause: I stayed at home.
Dependent clause: because it was raining.

A dependent clause often begins with a subordinating conjunction or a relative word such as because, although, when, if, who, or which.

2. Main Clause and Dependent Clause

Independent clause (Main clause)

It expresses a complete thought and can stand alone as a sentence.

  • I went to bed early.
  • She passed the exam.
  • We will call you.
Dependent clause (Subordinate clause)

It does not normally express a complete thought by itself.

  • because I was tired
  • although she was nervous
  • when the class ended
Complete complex sentence: Although she was nervous, she gave a good speech.

3. Complex Sentences with Because, Although, and Since

ConnectorUseExampleHindi meaning
becauseReasonI stayed home because I was ill.मैं घर पर रहा क्योंकि मैं बीमार था।
althoughContrastAlthough it was cold, we went outside.हालाँकि ठंड थी, फिर भी हम बाहर गए।
sinceReason or timeSince you are here, let's begin.चूँकि तुम यहाँ हो, चलो शुरू करते हैं।
even thoughStrong contrastEven though he was tired, he continued working.थका होने के बावजूद, वह काम करता रहा।
whileTwo actions at the same time or contrastWhile I cooked, my sister set the table.जब मैं खाना बना रहा था, मेरी बहन ने मेज़ लगाई।
Do not normally use although and but together in the same clause structure.
Correct: Although he was tired, he continued working.
Correct: He was tired, but he continued working.

4. Complex Sentences with Time Clauses

Time clauses tell us when something happens. Common connectors include when, before, after, until, as soon as, and while.

SentenceHindi meaning
When I reached the station, the train had left.जब मैं स्टेशन पहुँचा, ट्रेन जा चुकी थी।
Please wash your hands before you eat.खाने से पहले अपने हाथ धो लें।
After she finished her work, she went home.काम पूरा करने के बाद वह घर चली गई।
Wait here until I return.जब तक मैं वापस न आऊँ, यहाँ इंतज़ार करो।
As soon as the bell rings, the students will leave.घंटी बजते ही विद्यार्थी चले जाएँगे।
For future meaning, use the present simple in a time clause: “When she arrives, we will start.” Avoid “When she will arrive” in this structure.

5. Complex Sentences with If and Unless

Conditional clauses describe a condition and its result.

  • If you practise daily, you will improve.
  • If I had more time, I would learn another language.
  • Unless you hurry, you will miss the bus.
  • If she had left earlier, she would have caught the train.

Unless usually means “if not.”

Hindi: अगर तुम रोज़ अभ्यास करोगे, तो तुम्हारी प्रगति होगी।
Structure: If/Unless + condition clause, main clause.

6. Relative Clauses in Complex Sentences

A relative clause describes a noun. It often begins with who, whom, whose, which, that, where, or when.

SentenceRelative clauseHindi meaning
The woman who teaches us is very kind.who teaches usजो महिला हमें पढ़ाती हैं, वह बहुत दयालु हैं।
I bought the book that you recommended.that you recommendedमैंने वह किताब खरीदी जिसकी तुमने सलाह दी थी।
This is the town where my father was born.where my father was bornयह वह शहर है जहाँ मेरे पिता का जन्म हुआ था।
The student whose bag was lost informed the teacher.whose bag was lostजिस विद्यार्थी का बैग खो गया था, उसने शिक्षक को बताया।

7. Punctuation in Complex Sentences

When the dependent clause comes first, a comma is usually used after it. When the main clause comes first, a comma is often unnecessary.

Dependent clause firstMain clause first
Because I was tired, I went to bed early.I went to bed early because I was tired.
Although it was raining, we went out.We went out although it was raining.
If you need help, call me.Call me if you need help.
Avoid a sentence fragment: “Because I was tired.” By itself, this usually leaves the reader waiting for the main idea.
Complete: “Because I was tired, I went to bed early.”

8. Daily-Use Complex Sentences

No.English sentenceHindi meaning
1I will call you when I reach home.जब मैं घर पहुँचूँगा, तो तुम्हें फोन करूँगा।
2Although he is young, he is very responsible.हालाँकि वह युवा है, फिर भी बहुत ज़िम्मेदार है।
3She smiled because she was happy.वह मुस्कुराई क्योंकि वह खुश थी।
4If you need anything, please tell me.अगर तुम्हें किसी चीज़ की ज़रूरत हो, तो मुझे बताना।
5We waited until the rain stopped.हमने बारिश रुकने तक इंतज़ार किया।
6The man who lives next door is a doctor.जो आदमी बगल में रहता है, वह डॉक्टर है।
7Since I was busy, I could not attend the meeting.क्योंकि मैं व्यस्त था, इसलिए मीटिंग में शामिल नहीं हो सका।
8Before you make a decision, think carefully.फैसला करने से पहले अच्छी तरह सोचो।

9. Common Mistakes

IncorrectCorrectReason
Because I was ill. (as a complete sentence)Because I was ill, I stayed home.Add a main clause.
Although it was late, but we continued.Although it was late, we continued.Do not normally use although and but together.
When he will come, I will tell him.When he comes, I will tell him.Use present simple in a future time clause.
If you study, then you will pass. (then is unnecessary here)If you study, you will pass.Then can be used for emphasis, but it is usually unnecessary.

10. Quick Quiz

Choose the correct answer for each question.

1. I stayed home _____ I was sick.

2. _____ you finish your work, you can go home.

3. Which sentence is correct?

Lesson Summary
  • A complex sentence contains one independent clause and at least one dependent clause.
  • Use connectors such as because, although, when, if, and unless to show relationships between ideas.
  • Use a comma when a dependent clause comes first in many common sentence patterns.
  • Make sure the sentence contains a complete main idea.