English Grammar in Use · Murphy

Intermediate Grammar

Master English grammar one unit at a time. Clear notes, then 40+ interactive exercises with instant feedback – based on the topics in English Grammar in Use (Intermediate).

UNIT 1

Continuous or simple?

Present perfect cont.

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UNIT 10

Perfect: cont. or simple?

Future: present tenses

Future: will / going to

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UNIT 24

Future cont. & perfect

Must / mustn’t / needn’t

Had better / It’s time

If I knew / I wish I knew

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UNIT 40

If I had known / I wish I had known

Verb + -ing or to … 1

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UNIT 57

Verb + -ing or to … 2

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UNIT 32 · Intermediate · B1–B2

Must, mustn’t and needn’t“must · mustn’t · needn’t · needn’t have done” – 44 interactive questions

Correct answers

🎉 Brilliant! You finished all 44 questions of Unit 32!

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Video lesson – coming soon

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📖 Grammar Reference – Must, mustn’t and needn’t

Study the notes, then work through the six exercises.

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What you’ll learnNeedn’t vs Mustn’t & Needn’t have done vs Didn’t need to do

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~20 min4-Tier notes + 4 exercises (32.1–32.4)

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25 questionsInstant automated feedback

1 Tier 1 – The Concept & Nuance: Lack of Necessity vs Prohibition

Needn’t (= don’t need to) expresses that something is not necessary. Mustn’t means you are prohibited from doing something.

🆓 Needn’t (Not Necessary)

– “You needn’t come if you’re busy.” = “You don’t need to come.”
– “We have plenty of time. We needn’t hurry.”

⛔ Mustn’t (Strict Prohibition)

– “You mustn’t tell anyone. It’s a secret.”

2 Tier 2 – Needn’t have done vs Didn’t need to do

You needn’t have rushed.	You did it, but it was unnecessary (wasted effort).
You didn’t need to rush.	It was unnecessary, so you generally didn’t do it.

3 Tier 3 – Top 3 Common Learner Pitfalls

✗ ~~Why did you buy bread? We have plenty! You didn’t need to buy it. (said holding the extra bread)~~

✓ You needn’t have bought it!

– Rule: When an unnecessary action was actually performed, use needn’t have + past participle.

✗ ~~You needn’t to hurry.~~

✓ You needn’t hurry. / You don’t need to hurry.

– Rule: Modal needn’t is followed by bare infinitive without to.

✗ ~~You mustn’t finish the report today; tomorrow is fine.~~

✓ You needn’t finish the report today.

– Rule: Use needn’t or don’t have to for absence of necessity.

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Tier 4 – Interactive Practice: Complete Exercises 32.1–32.4 below to test needn’t and mustn’t usage!

Made with care for English learners · allenglish4u.com
Original practice material inspired by the English Grammar in Use syllabus (Cambridge University Press). Example sentences and exercises are written by All English 4U.