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Interactive Grammar: Unless and Conditionals quiz

Use 'unless' and 'if … not' in conditional sentences to express exceptions, warnings, and negative conditions.

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Grammar Explanation · Authentic Examples · Practice Questions

Lesson progressNot started
Duration
~64 min
Questions
43
Level
Intermediate

Overview

'Unless' means 'if not' and introduces a negative condition. Example: Unless you study, you will fail (= If you do not study, you will fail). It is used in first and second conditionals and adds a sense of exception or warning.

Unless = If … not

  • structureUnless + present simple, future simple
  • meaningUnless = if … not: Unless you hurry = If you don't hurry.
  • exampleUnless you study, you will fail.
  • exampleI won't go unless you come with me.

Important rules

  • After unless, use present simple (not 'will'): Unless you hurry …
  • Unless is never used with a negative: ❌ Unless you don't study.
  • Compare: unless (if not) ≠ even if (regardless)

Common Mistakes

  • ❌ Unless you won't hurry. → ✅ Unless you hurry.
  • ❌ Unless she doesn't study, she'll fail. → ✅ Unless she studies, she'll fail.
  • ❌ Unless if you register. → ✅ Unless you register. (no 'if')

When to use

Rules & policies

Unless you have a ticket, you cannot enter.

Conditions

Unless the terms improve, we won't sign.

Academic warnings

Unless you cite sources, marks will be deducted.

Conversations

Unless you tell me, I can't help you.

Multiple Choice

Choose unless or if … not to complete each sentence correctly

Multiple Choice15 questionsB1 — Intermediate~23 min
1I won't go you come with me.
2'Unless' means .
3 you study, you will fail.
4I won't go unless you with me.
5Which is incorrect?
6The meeting will be cancelled we reach a quorum.
7She come unless she finishes her work first.
8'Unless you hurry' = .
9Which sentence uses 'unless' correctly?
10After 'unless', we use .
11 you have a reservation, the restaurant may be full.
12He will not succeed he works harder.
13'You won't get the job if you don't prepare' = You won't get the job .
14Which use is NOT correct for 'unless'?
15She will be upset you apologise immediately.
Progress0 of 15 answered

Fill in the Blanks

Complete with unless or if … not

Fill in the Blanks10 questionsB1 — Intermediate~15 min
1(Unless/If not)you study, you won't pass.
2I won't go(unless/if not)you come with me.
3He(unless/won't go unless)he gets better, he won't play.
4(Unless/If)there is rain, we will go out.
5She will feel rejected(unless/if)you apologise now.
6The project will fail(unless/although)we get more funding.
7(Unless/If not)it is an emergency, do not call after nine.
8I will help you(unless/if)you don't want me to.
9They won't attend(unless/although)the venue changes.
10(Unless/Because)you book early, you may not get a seat.
Progress0 of 10 answered

Transform the Sentences

Rewrite using 'unless' instead of 'if … not'

Transform8 questionsB1 — Intermediate~12 min

1If you don't leave now, you will miss the train. → → Use 'unless'

2If she doesn't apologise, he will be upset. → → Use 'unless'

3If they don't act quickly, the problem will worsen. → → Use 'unless'

4If you don't have a ticket, you cannot enter. → → Use 'unless'

5If he doesn't revise, he will fail. → → Use 'unless'

6I won't accept the offer if it doesn't improve. → → Use 'unless'

7The project will fail if we don't get more funding. → → Use 'unless'

8She won't agree if the terms don't change. → → Use 'unless'

Progress0 of 8 answered

Fix the Errors

Correct the mistake in each 'unless' sentence

Error Fix10 questionsB1 — Intermediate~15 min

1Unless you won't hurry, you'll be late.

2I won't come unless if you invite me.

3Unless she doesn't study, she'll fail.

4He won't come unless he will get an invitation.

5Unless you not leave now, you'll miss the bus.

6She unless studies hard, she won't pass.

7The event will be cancelled unless if it rains.

8Unless she doesn't apologise, he stays angry.

9I can't help you unless you don't ask me.

10Unless you won't register, you can't attend.

Progress0 of 10 answered

Frequently Asked Questions

What does this lesson on unless and Conditionals cover?

Use 'unless' and 'if … not' in conditional sentences to express exceptions, warnings, and negative conditions.

Which CEFR level is this lesson designed for?

This lesson is designed for Intermediate (B1) learners and forms part of the Conditionals section on Grammartier.

What is the best approach for studying unless and Conditionals?

Start with the definition above, then work through the examples to see how unless and Conditionals behaves in context. Since this is a Intermediate (B1) topic within conditionals, focus on using the structure accurately in context and noticing the mistakes learners typically make with it — this is the level where small errors start to matter for fluency. Finish with the quiz below to check what's actually sticking.

How does unless and Conditionals relate to the rest of conditionals?

Unless and Conditionals is one of the Intermediate–level topics grouped under Conditionals on Grammartier. Understanding it well makes the related lessons in the same category easier to follow — use the related-lessons links on this page to keep building on it once you've completed this quiz.

Your Grammar Learning Path

Follow the CEFR progression for this topic cluster.

  1. B1
    Interactive Grammar: First Conditional quiz
  2. B1
    Interactive Grammar: Second Conditional quiz
  3. B1
    Interactive Grammar: Unless and Conditionals quizYou are here
  4. B1
    Interactive Grammar: Conditional Tenses quiz
  5. B2
    Interactive Grammar: Advanced Second Conditional quiz
  6. B2
    Interactive Grammar: Advanced Third Conditional quiz
  7. B2
    Interactive Grammar: Conditional Alternatives quiz

Before You Start

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Related Concepts

Deepen your grammar knowledge with these related B1 topics.

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