How to Join Sentences Using When, Where, Which, and Why | English Grammar for Board Exams

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How to Join Sentences 

Using When, Where, Which, and Why


Which, when, why, where


Joining sentences correctly is one of the most important skills you need to score full marks in the English Grammar section of your Class 10 and Class 12 board exams. Whether you are writing an essay or solving the "Do as Directed" section, using relative pronouns like when, where, which, and why makes your writing look advanced and professional. If you have already practised our previous lesson on [Click here to read: Insert the title of your Direct/Indirect Speech or 
Tenses post], learning how to combine sentences is your perfect next step. Let's look at the rules, some easy solved examples, and practice exercises!

The Grammar Rule 

  • When: Used to join sentences related to Time.

  • Where: Used to join sentences related to Place.

  • Which: Used to join sentences related to Things or Animals.

  • Why: Used to join sentences related to a Reason.

Part 1: Joining with "When" (Time)

Question 1:

I will never forget that golden day. I won the first prize in the essay competition on that day.

Answer: I will never forget that golden day when I won the first prize in the essay competition.

Question 2:

The teacher entered the classroom. All the students immediately stopped talking.

Answer: All the students immediately stopped talking when the teacher entered the classroom.

Part 2: Joining with "Where" (Place)

Question 3:

This is the historical fort. Chhatrapati Shivaji Maharaj was born here.

Answer: This is the historical fort where Chhatrapati Shivaji Maharaj was born.

Question 4:

We visited the beautiful village in the Konkan. My grandfather lived there for fifty years.

Answer: We visited the beautiful village in the Konkan where my grandfather lived for fifty years.

Question 5: 

The student is looking for a quiet library. She can study peacefully for her board exams there.

Answer: The student is looking for a quiet library where she can study peacefully for her board exams.

Part 3: Joining with "Which" (Things / Animals)

Question 6:

I have lost the expensive pen. My elder sister gave it to me on my birthday.

Answer: I have lost the expensive pen which my elder sister gave me on my birthday.

Question 7:

The teacher taught us a new grammar rule today. It was very difficult to understand at first.

Answer: The teacher taught us a new grammar rule today, which was very difficult to understand at first.

Question 8:

Rohan bought a new science reference book. It contains five solved question papers.

Answer: Rohan bought a new science reference book which contains five solved question papers.

Part 4: Joining with "Why" (Reason)

Question 9:

The little girl was crying bitterly in the park. Nobody knew the reason for it.

Answer: Nobody knew the reason why the little girl was crying bitterly in the park.

Question 10:

The principal suddenly cancelled the annual sports day. He did not explain the reason to the students.

Answer: The principal did not explain the reason to the students why he suddenly cancelled the annual sports day.

Ten More Solved Sentence Pairs (For extra practice)

Question 11:

  • I bought a new bicycle yesterday.

  • It is red in colour.
    Answer: I bought a new bicycle yesterday which is red in colour.

Question 12:

  • This is the famous temple.

  • We prayed there last year.
    Answer: This is the famous temple where we prayed last year.

Question 13:

  • The telephone suddenly rang.

  • I was sleeping peacefully at that time.
    Answer: The telephone suddenly rang when I was sleeping peacefully.

Question 14:

  • The boy came late to school today.

  • The strict teacher asked the reason.
    Answer: The strict teacher asked the reason why the boy came late to school today.

Question 15:

  • My mother baked a delicious chocolate cake.

  • It was completely eaten in five minutes.
    Answer: My mother baked a delicious chocolate cake which was completely eaten in five minutes.

Question 16:

  • We finally reached the large stadium.

  • The final cricket match was being played there.
    Answer: We finally reached the large stadium where the final cricket match was being played.

Question 17:

  • The guests arrived at our house.

  • We were having our dinner at that moment.
    Answer: The guests arrived at our house when we were having our dinner.

Question 18:

  • She is wearing a beautiful traditional dress.

  • It is made of pure silk.
    Answer: She is wearing a beautiful traditional dress which is made of pure silk.

Question 19:

  • You look very sad and upset today.

  • Please tell me the reason for it.
    Answer: Please tell me the reason why you look very sad and upset today.

Question 20:

  • I kept my house keys somewhere safely.

  • I cannot remember the place now.
    Answer: I cannot remember the place where I kept my house keys safely.

Interactive Exercise: 

Fill in the Blanks.

Exercise 1: Fill in the blanks using when, where, which, or why.

  1. Do you know the exact time ________ the Mumbai Express train arrives?

  2. This is the old hospital ________ my grandfather was born.

  3. Nobody knows the reason ________ the principal declared a holiday today.

  4. I have a smart pet dog ________ loves to catch a plastic ball.

  5. I still remember the rainy day ________ we first met at the college gate.

(Answers for students: 1. when, 2. where, 3. why, 4. which, 5. when)

Exercise 2: Match the columns to make meaningful sentences

Combine Part A and Part B using the correct connector from the middle column.

Part A (Main Clause) Connector Part B (Subordinate Clause)
1. I know the exact place why a. I was doing my homework.
2. The blue pen when b. I bought yesterday is lost.
3. The lights went out where c. you are so angry with me.
4. Please tell me the reason which d. Chhatrapati Shivaji Maharaj was crowned.


Practice makes perfect! Try writing down these examples in your grammar notebook and solving the exercises without looking at the answers first. Mastering the use of when, where, which, and why will guarantee you score those precious marks in your board exams.

If you found this grammar lesson helpful, you will also love our step-by-step guide on [ Click here to read: Insert the title of your Formal Letter Format or Summary Writing post].

Keep practising your grammar daily, bookmark this page for your final exam revision, and share it with your classmates. Best of luck with your studies!

The author of -

Communication Skills in English For Engineers and Technologists

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