Conditional Sentences Exercises with Answers for English Grammar Practice

Conditional sentences are an important part of English grammar because they help express possibilities, conditions, results, and imaginary situations. They explain what may happen, what could have happened, or what would happen under certain circumstances. Since conditional sentences are commonly used in everyday communication, mastering them is essential for forming clear and meaningful sentences.

Regular practice of conditional sentences exercises helps you understand the structure and usage of different conditional forms, including zero, first, second, third, and mixed conditionals. This guide includes a variety of conditional sentences exercises with answers to strengthen understanding and help you apply conditionals correctly in both written and spoken English.

Table of Contents

• Conditional Sentences Exercises with Answers
• Exercise 1: Identify the Type of Conditional Sentence
• Exercise 2: Fill in the Blanks with the Correct Form of the Verb
• Exercise 3: Rewrite the Sentences as Directed
• Exercise 4: Choose the Correct Option​
• Exercise 5: Error Correction in Conditional Sentences​

Conditional Sentences Exercises with Answers

Practising grammar regularly is one of the most effective ways to understand and use conditional sentences correctly. Conditional sentences help express facts, possibilities, hypothetical situations, and consequences based on specific conditions. Understanding how different conditional structures work is essential for sentence accuracy and meaningful communication. The following exercises are designed to test your understanding of different types of conditional sentences and their proper usage. 

Exercise 1: Identify the Type of Conditional Sentence

Read the following sentences and identify the type of conditional sentence used.

1. If you heat water to 100°C, it boils.

2. If she studies harder, she will score better marks.

3. If I were the principal, I would change the rules.

4. If they had informed us earlier, we would have attended the meeting.

5. If you mix blue and yellow, you get green.

6. If he apologises, I will forgive him.

7. If I had enough money, I would buy a new laptop.

8. If she had practised regularly, she would have won the competition.

9. If people exercise regularly, they stay healthy.

10. If you leave now, you will reach on time.

11. If I knew the answer, I would tell you.

12. If he had left earlier, he would have caught the train.

13. If metal gets hot, it expands.

14. If they invite me, I will attend the function.

15. If I had studied medicine, I would have become a doctor.

16. If children eat too much sugar, they get cavities.

17. If she called me, I would help her.

18. If we had booked tickets earlier, we would have got better seats.

19. If you freeze water, it turns into ice.

20. If he works consistently, he will achieve success.

Answers

1. Zero Conditional

2. First Conditional

3. Second Conditional

4. Third Conditional

5. Zero Conditional

6. First Conditional

7. Second Conditional

8. Third Conditional

9. Zero Conditional

10. First Conditional

11. Second Conditional

12. Third Conditional

13. Zero Conditional

14. First Conditional

15. Third Conditional

16. Zero Conditional

17. Second Conditional

18. Third Conditional

19. Zero Conditional

20. First Conditional

Exercise 2: Fill in the Blanks with the Correct Form of the Verb

Fill in the blanks using the correct verb form.

1. If he _____ (study) harder, he will pass the exam.

2. If I _____ (be) rich, I would travel the world.

3. If they had reached earlier, they _____ (not miss) the train.

4. If water _____ (freeze), it turns into ice.

5. If she _____ (call) me, I will help her.

6. If I had known the truth, I _____ (not believe) him.

7. If he _____ (exercise) regularly, he would stay fit.

8. If the weather improves, we _____ (go) for a picnic.

9. If people _____ (eat) healthy food, they remain energetic.

10. If I _____ (see) him yesterday, I would have spoken to him.

11. If she practised daily, she _____ (improve) her skills.

12. If they had invited us, we _____ (attend) the party.

13. If you _____ (touch) fire, you get burned.

14. If he leaves now, he _____ (arrive) on time.

15. If I had enough time, I _____ (learn) Spanish.

16. If she had studied seriously, she _____ (score) better.

17. If plants _____ (not get) sunlight, they die.

18. If we save money, we _____ (buy) a car next year.

19. If he were more confident, he _____ (perform) better.

20. If I had listened carefully, I _____ (understand) the lesson.

Answers

1. studies

2. were

3. would not have missed

4. freezes

5. calls

6. would not have believed

7. exercised

8. will go

9. eat

10. had seen

11. would improve

12. would have attended

13. touch

14. will arrive

15. would learn

16. would have scored

17. do not get

18. will buy

19. would perform

20. would have understood

Learn More: Conditional Verb in English: Definition, Types, Condition and Conclusion Explained

Exercise 3: Rewrite the Sentences as Directed

Rewrite the following sentences according to the condition given.

1. He does not exercise. He is unhealthy. (Use second conditional)

2. She missed the train because she woke up late. (Use third conditional)

3. Study hard. You will pass the exam. (Use first conditional)

4. Ice melts when heated. (Rewrite as zero conditional)

5. I do not know her number, so I cannot call her. (Use second conditional)

6. They arrived late, so they missed the event. (Use third conditional)

7. Water evaporates when heated. (Rewrite as zero conditional)

8. Work hard. You will succeed. (Use first conditional)

9. I am not a bird, so I cannot fly. (Use second conditional)

10. He forgot his ticket, so he could not enter. (Use third conditional)

11. Plants die without water. (Rewrite as zero conditional)

12. She is not confident, so she avoids interviews. (Use second conditional)

13. We did not leave early, so we missed the bus. (Use third conditional)

14. Press this button. The machine starts. (Use zero conditional)

15. Save money. You can buy a house. (Use first conditional)

16. I did not revise well, so I performed poorly. (Use third conditional)

17. He does not speak French, so he cannot understand them. (Use second conditional)

18. Add salt to water. It tastes different. (Use zero conditional)

19. Finish the work. You can go home. (Use first conditional)

20. She did not attend classes, so she failed. (Use third conditional)

Answers

1. If he exercised, he would be healthy.

2. If she had not woken up late, she would not have missed the train.

3. If you study hard, you will pass the exam.

4. If ice is heated, it melts.

5. If I knew her number, I would call her.

6. If they had arrived on time, they would not have missed the event.

7. If water is heated, it evaporates.

8. If you work hard, you will succeed.

9. If I were a bird, I would fly.

10. If he had remembered his ticket, he could have entered.

11. If plants do not get water, they die.

12. If she were confident, she would attend interviews.

13. If we had left early, we would not have missed the bus.

14. If you press this button, the machine starts.

15. If you save money, you can buy a house.

16. If I had revised well, I would have performed better.

17. If he spoke French, he would understand them.

18. If you add salt to water, it tastes different.

19. If you finish the work, you can go home.

20. If she had attended classes, she would not have failed.

Exercise 4: Choose the Correct Option

Choose the correct answer.

1. If she _____ harder, she would succeed.
   a) studies
   b) studied
   c) study

2. If I had known, I _____ helped you.
   a) will have
   b) would have
   c) had

3. If water _____, it becomes steam.
   a) boils
   b) boiled
   c) boiling

4. If they arrive early, we _____ dinner together.
   a) have
   b) will have
   c) had

5. If I _____ taller, I would play basketball.
   a) am
   b) were
   c) was

6. If he had worked harder, he _____ promoted.
   a) would have been
   b) will be
   c) was

7. If you heat metal, it _____.
   a) expands
   b) expanded
   c) expanding

8. If I see him, I _____ him the message.
   a) gave
   b) will give
   c) giving

9. If she _____ the truth, she would be upset.
   a) knows
   b) knew
   c) knowing

10. If we had left earlier, we _____ late.
    a) would not have been
    b) will not be
    c) are not

11. If plants get sunlight, they _____.
    a) grow
    b) grew
    c) growing

12. If he apologises, I _____ him.
    a) forgive
    b) forgave
    c) will forgive

13. If I _____ rich, I would buy a villa.
    a) was
    b) were
    c) am

14. If they had invited us, we _____ gone.
    a) would have
    b) will have
    c) had

15. If the weather improves, we _____ outside.
    a) go
    b) will go
    c) went

16. If I knew the answer, I _____ you.
    a) tell
    b) would tell
    c) told

17. If he had listened carefully, he _____ understood.
    a) would have
    b) will
    c) had

18. If people exercise, they _____.
    a) stay fit
    b) stayed fit
    c) staying fit

19. If she calls me, I _____ immediately.
    a) respond
    b) will respond
    c) responded

20. If I had practised more, I _____ better.
    a) perform
    b) would have performed
    c) performed

Answers

1. b) studied

2. b) would have

3. a) boils

4. b) will have

5. b) were

6. a) would have been

7. a) expands

8. b) will give

9. b) knew

10. a) would not have been

11. a) grow

12. c) will forgive

13. b) were

14. a) would have

15. b) will go

16. b) would tell

17. a) would have

18. a) stay fit

19. b) will respond

20. b) would have performed

Exercise 5: Error Correction in Conditional Sentences

Correct the errors in the following sentences.

1. If I will see him, I tell him.

2. If she studied harder, she will pass.

3. If I knew the answer, I will tell you.

4. If they had hurry, they would catch the train.

5. If water boil, it turns into steam.

6. If he apologised, I will forgive him.

7. If she had practiced more, she would wins.

8. If I were rich, I will buy a mansion.

9. If plants not get water, they die.

10. If they invite us, we attended.

11. If he worked harder, he succeeds.

12. If you heat ice, it melted.

13. If I had seen him, I would spoke to him.

14. If she studies, she pass.

15. If he were careful, he avoid mistakes.

16. If they had informed me, I come.

17. If people exercised, they stays healthy.

18. If you press this button, the machine start.

19. If she had revised, she pass the exam.

20. If I know the truth, I would react differently.

Answers

1. If I see him, I will tell him.

2. If she studied harder, she would pass.

3. If I knew the answer, I would tell you.

4. If they had hurried, they would have caught the train.

5. If water boils, it turns into steam.

6. If he apologises, I will forgive him.

7. If she had practised more, she would have won.

8. If I were rich, I would buy a mansion.

9. If plants do not get water, they die.

10. If they invite us, we will attend.

11. If he worked harder, he would succeed.

12. If you heat ice, it melts.

13. If I had seen him, I would have spoken to him.

14. If she studies, she will pass.

15. If he were careful, he would avoid mistakes.

16. If they had informed me, I would have come.

17. If people exercised, they would stay healthy.

18. If you press this button, the machine starts.

19. If she had revised, she would have passed the exam.

20. If I knew the truth, I would react differently.

Learn More: Tenses Exercises with Answers | Practice English Tenses