Conditional sentences exercises: zero, first, second and third
Complete the sentences and check answers
Complete the conditional sentences exercises below to test your knowledge of conditionals.
1. If you _____________ (heat) water to 100 degrees Celsius, it _____________ (boil). .
2. If I _____________ (ask) my dog to sit, he _____________ (obey) me. .
3. You _____________ (need) travel insurance if you _____________ (go) on holiday overseas. .
4. If people _____________ (not exercise), they _____________ (become) unfit. .
5. I _____________ (feel) better if I _____________ (eat) well. .
Conditional sentences exercises – first conditional
6. If I _____________ (find) her phone number, I _____________ (send) it to you. .
7. He _____________ (feel) ill if he _____________ (eat) all those sweets! .
8. If you _____________ (talk) to him, he _____________ (understand) your problem. .
9. I _____________ (visit) you if I _____________ (come) to your hometown next year. .
10. If she _____________ (finish) work late, she _____________ (meet) us at the restaurant. .
Conditional sentences exercises – second conditional
11. If I _____________ (know) how to contact him, I _____________ (tell) him the news. .
12. If he _____________ (ask) her to marry him, she _____________ (say) ‘yes’. .
13. He _____________ (not make) so many mistakes if he _____________ (listen) to instructions. .
14. I _____________ (buy) a boat if I _____________ (have) more money. .
15. If he _____________ (try) it, he _____________ (like) it! .
Conditional sentences exercises – third conditional
16. If I _____________ (see) him last week, I _____________ (invite) him. .
17. If I _____________ (know) you were in trouble, I _____________ (help) you. .
18. I _____________ (never met) you if _____________ (not go) to that party! .
19. If I _____________ (take) my car for a service, it _____________ (not break down) last night. .
20. She _____________ (not gone) there if I _____________ (warn) her. .
BOOST YOUR VOCABULARY! Here’s a glossary of key words from this post:
| Word (Part of Speech) | Definition | Example |
|---|---|---|
| Conditional (adjective) | showing a result that depends on something else | In English, conditional sentences show what will happen if a condition is met. |
| Celsius (noun) | a scale for measuring temperature (°C) | Water boils at 100 degrees Celsius. |
| Obey (verb) | to do what someone asks or tells you to do | If you tell the dog to sit, it will obey you. |
| Insurance (noun) | a service that pays money if something bad happens | You should have travel insurance before you go abroad. |
| Overseas (adverb/adjective) | in or to another country across the sea | They went on holiday overseas last summer. |
| Unfit (adjective) | not healthy or not strong enough | If you don’t exercise, you can become unfit. |
| Exercise (verb/noun) | physical activity to keep the body healthy | Regular exercise helps improve fitness. |
| Preparation (noun) | the work you do to get ready for something | Good preparation helps you perform well in exams. |
| Service (noun) | work done to keep things working, for example for a car | If I had taken my car for a service, it might not have broken down. |
| Break down (phrasal verb) | to stop working (for a machine or vehicle) | The car broke down on the way home. |