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 31 · Intermediate · B1–B2

Have to and must“have to · must · mustn’t · don’t have to” – 44 interactive questions

Correct answers

🎉 Brilliant! You finished all 44 questions of Unit 31!

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📖 Grammar Reference – Have to and must

Study the notes, then work through the six exercises.

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What you’ll learnHave to vs Must for obligation & Don’t have to (no obligation) vs Mustn’t (prohibition)

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~20 min4-Tier notes + 4 exercises (31.1–31.4)

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26 questionsInstant automated feedback

1 Tier 1 – The Concept & Nuance: External Rules vs Personal Obligation

Have to describes external rules, laws, and facts beyond the speaker’s control. Must expresses personal obligation and strong personal insistence from the speaker.

📋 HAVE TO (External Rules)

– “You have to have a visa to visit that country.” (Rule).
– “I have to wear glasses for reading.”

🗣️ MUST (Speaker’s Insistence)

– “I haven’t called Paul for ages. I must phone him tonight.”
– “You must come and see us sometime.”

2 Tier 2 – Don’t have to vs Mustn’t (The Critical Difference)

You don’t have to do it	No obligation (you can do it if you want, but it is not necessary): “Tomorrow is Sunday; I don’t have to get up early.”
You mustn’t do it	Strict prohibition (do not do it; it is against the rules): “You mustn’t touch that wire!”

3 Tier 3 – Top 3 Common Learner Pitfalls

✗ ~~You mustn’t pay for the museum; entry is completely free.~~

✓ You don’t have to pay for the museum; entry is completely free.

– Rule: When an action is not required (optional), use don’t have to (or needn’t).

✗ ~~Yesterday I must go to the dentist.~~

✓ Yesterday I had to go to the dentist.

– Rule: Must has no past form; use had to for past obligations.

✗ ~~Do you must work on Saturdays?~~

✓ Do you have to work on Saturdays?

– Rule: Questions about routine obligations use Do you have to…?

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Tier 4 – Interactive Practice: Work through Exercises 31.1–31.4 below with instant scoring!

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.