Grammar Exercise: If or Unless

If or Unless Exercises with Answers

Practice the difference between if and unless with these interactive exercises and answers.
This activity helps you understand how unless works as a negative conditional and how it compares to if. Ideal for ESL/EFL learners and school students.

If or Unless – Grammar Practice

INSTRUCTIONS

Do the exercise below on the difference between if and unless, and click the button to check your answers.

Before doing the exercises, you may want to read the lesson on conditional sentences

Important rule:

  • Unless means “if … not”
    • ✔ I won’t go out unless it stops raining.
    • ✔ I won’t go out if it doesn’t stop raining.

Choose the correct answer (if or unless)

  1. you help me, I'll be unable to do it .
  2. I meet him, I'll tell him the whole truth.
  3. You won't get well you stop smoking.
  4. you exercise regularly, you won't be able to lose some weight.
  5. you exercise regularly, you'll lose some weight.
  6. The teacher will be furious you don't the homework.
  7. You can't go on vacation you don't save some money.
  8. You will feel cold you wear a warm jacket.
  9. We'll arrive on time we hurry.
  10. Don't call me it's an emergency.

More Practice: Unless Exercises (Rewrite the Sentences)

Rewrite each sentence using unless. Do not change the meaning.

  1. You won’t understand the lesson if you don’t listen carefully.
    → You won’t understand the lesson unless ___________.
  2. I won’t call you if it isn’t urgent.
    → I won’t call you unless ___________.
  3. We won’t arrive on time if we don’t leave early.
    → We won’t arrive on time unless ___________.
  4. She won’t improve her English if she doesn’t practise regularly.
    → She won’t improve her English unless ___________.
  5. You can’t enter the building if you don’t have an ID card.
    → You can’t enter the building unless ___________.
  6. He won’t finish the project if he doesn’t get help.
    → He won’t finish the project unless ___________.
  7. They won’t go on holiday if they don’t save enough money.
    → They won’t go on holiday unless ___________.
  8. I won’t forgive him if he doesn’t apologise.
    → I won’t forgive him unless ___________.
  9. You won’t feel better if you don’t take some rest.
    → You won’t feel better unless ___________.
  10. The teacher won’t be satisfied if the students don’t do their homework.
    → The teacher won’t be satisfied unless ___________.
1. You won’t understand the lesson unless you listen carefully.
2. I won’t call you unless it is urgent.
3. We won’t arrive on time unless we leave early.
4. She won’t improve her English unless she practises regularly.
5. You can’t enter the building unless you have an ID card.
6. He won’t finish the project unless he gets help.
7. They won’t go on holiday unless they save enough money.
8. I won’t forgive him unless he apologises.
9. You won’t feel better unless you take some rest.
10. The teacher won’t be satisfied unless the students do their homework.

Explanation: If vs Unless

Recap: Unless Vs If Exercises

Unless means “if … not” and is used to express a negative condition. Because unless already has a negative meaning, we usually do not use another negative verb in the same clause.

  • I won’t go out unless it stops raining.
    (= I won’t go out if it doesn’t stop raining.)
  • You won’t pass the exam unless you study.
    (= You won’t pass the exam if you don’t study.)

Tip:
If you can replace unless with “if … not” and keep the same meaning, the sentence is correct.

Tags: Exercises on Advanced GrammarExercises on Conditional Sentences
Shopping Cart
Scroll to Top