Mustn’t vs. Don’t have to – English Grammar Exercises for B1
Choose the best option (A, B, C, or D) to complete each sentence. Read the text carefully, as all questions are part of a continuous consultation between an allergist and a patient with a severe, life-threatening peanut allergy.
“Please listen to me very carefully. Your test results show a severe reaction to peanuts.”
1 This is a matter of life and death: you ______ eat peanuts or anything containing peanut oil ever again.
(a) don’t have to
(b) shouldn’t
(c) mustn’t
(d) mustn’t to
2 You ______ ignore this allergy. Even a tiny trace of peanut dust could trigger anaphylactic shock.
(a) haven’t to
(b) mustn’t
(c) don’t have to
(d) shouldn’t
3 Whenever you leave the house, you absolutely ______ forget to carry your epinephrine auto-injector (EpiPen).
(a) mustn’t
(b) don’t have to
(c) needn’t
(d) don’t must
4 Fortunately, the clinic provides these auto-injectors for free, so you ______ pay for your first one today.
(a) mustn’t
(b) shouldn’t
(c) haven’t to
(d) don’t have to
5 When you are at school or work, you ______ share snacks with your friends unless you know exactly what is inside.
(a) mustn’t sharing
(b) don’t have to
(c) shouldn’t
(d) mustn’t
6 You ______ buy any processed food product without thoroughly reading the ingredient list first.
(a) don’t have to
(b) mustn’t
(c) shouldn’t
(d) mustn’t to buy
7 If a warning label says “may contain traces of nuts”, you _____ eat it under any circumstances.
(a) don’t need
(b) don’t have to
(c) mustn’t
(d) shouldn’t
8 You _____ cook all your own meals from scratch every day, but you must be incredibly careful when eating out.
(a) don’t have to
(b) mustn’t
(c) haven’t to
(d) aren’t to
9 When eating at a restaurant, you _____ hesitate to inform the chef about your severe allergy. Speak up immediately!
(a) shouldn’t
(b) don’t have to
(c) mustn’t
(d) mustn’t to
10 Your parents _____ worry too much as long as you strictly follow these safety guidelines.
(a) mustn’t
(b) don’t have to
(c) haven’t to
(d) shouldn’t
11 However, your family members _____ leave you alone if you start showing symptoms of an allergic reaction.
(a) don’t have to
(b) mustn’t leaving
(c) needn’t
(d) mustn’t
12 If you feel your throat swelling, you _____ wait to see if it gets better; inject the EpiPen and call an ambulance immediately.
(a) mustn’t
(b) don’t have to
(c) don’t must
(d) shouldn’t
13 You _____ go to the emergency room for a simple common cold, but breathing trouble is a different story.
(a) mustn’t
(b) don’t have to
(c) wouldn’t
(d) haven’t to go
14 This allergy is highly unpredictable, meaning you _____ take it lightly.
(a) don’t have to
(b) shouldn’t
(c) mustn’t
(d) mustn’t to take
15 You _____ stay locked inside your house all day out of fear; just be cautious when eating outside.
(a) mustn’t
(b) not have to
(c) couldn’t
(d) don’t have to
16 If a friend offers you a homemade cookie, you _____ assume it is safe just because it looks like plain chocolate.
(a) don’t have to
(b) mustn’t
(c) mustn’t assuming
(d) shouldn’t
17 You _____ be shy about your condition; always announce it clearly so people know how to protect you.
(a) don’t have to
(b) don’t must
(c) mustn’t
(d) needn’t
18 I am warning you, you _____ test your allergy by eating a tiny amount of peanut butter to see what happens!
(a) mustn’t
(b) don’t have to
(c) aren’t supposed
(d) mustn’t to test
19 You _____ schedule another appointment until next year, unless you experience an accidental reaction.
(a) mustn’t
(b) haven’t to
(c) don’t have to
(d) shouldn’t
20 Remember, my young friend, you _____ let your guard down for even a single second when it comes to peanuts.
(a) don’t have to
(b) don’t must
(c) shouldn’t
(d) mustn’t
ANSWER KEY & EXPLANATIONS
1 (c) mustn’t
- Why it is correct: Eating peanuts will cause a life-threatening reaction. It is a strict medical prohibition.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake (implies “you don’t need to eat them, but you can if you want,” which is deadly). (d) “mustn’t to” is a Structural Error (modals do not take “to”). (b) “shouldn’t” is a Meaning Trap (too weak; “shouldn’t” implies bad advice, but “mustn’t” implies absolute danger).
2 (b) mustn’t
- Why it is correct: Ignoring the allergy will lead to anaphylactic shock. It is completely forbidden.
- Distractor Analysis: (c) “don’t have to” is a Common Mistake. (a) “haven’t to” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
3 (a) mustn’t
- Why it is correct: Forgetting the EpiPen is extremely dangerous. It is a strict rule not to forget it.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (d) “don’t must” is a Structural Error. (c) “needn’t” is a Meaning Trap (means “lack of necessity,” not prohibition).
4 (d) don’t have to
- Why it is correct: The clinic provides it for free, so paying is unnecessary. The obligation is removed.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake (you aren’t forbidden from paying, it’s just not required). (c) “haven’t to” is a Structural Error. (b) “shouldn’t” is a Meaning Trap.
5 (d) mustn’t
- Why it is correct: Sharing snacks blindly could kill the patient. It is prohibited.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (a) “mustn’t sharing” is a Structural Error (requires bare infinitive). (c) “shouldn’t” is a Meaning Trap.
6 (b) mustn’t
- Why it is correct: Buying food without checking labels is a dangerous gamble. It is strictly forbidden.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (d) “mustn’t to buy” is a Structural Error. (c) “shouldn’t” is a Meaning Trap.
7 (c) mustn’t
- Why it is correct: “May contain traces” means high risk. Eating it is absolutely prohibited.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (a) “don’t need” is a Structural Error (requires “to”). (d) “shouldn’t” is a Meaning Trap.
8 (a) don’t have to
- Why it is correct: Cooking every meal from scratch is not mandatory; eating out is allowed if careful.
- Distractor Analysis: (b) “mustn’t” is a Common Mistake. (c) “haven’t to” is a Structural Error. (d) “aren’t to” is a Structural Error.
9 (c) mustn’t
- Why it is correct: Hesitating to ask could lead to accidental consumption. You are strongly ordered not to hesitate.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (d) “mustn’t to” is a Structural Error. (a) “shouldn’t” is a Meaning Trap.
10 (b) don’t have to
- Why it is correct: If the rules are followed, the parents are freed from the obligation to worry.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (c) “haven’t to” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
11 (d) mustn’t
- Why it is correct: Leaving the patient alone during a reaction is a severe risk. It is forbidden.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (b) “mustn’t leaving” is a Structural Error. (c) “needn’t” is a Meaning Trap.
12 (a) mustn’t
- Why it is correct: Waiting could cause the throat to close completely. It is a fatal mistake that must be avoided.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake (implies “you don’t have to wait, but you can,” which is deadly). (c) “don’t must” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
13 (b) don’t have to
- Why it is correct: A common cold does not require an emergency room visit. It is unnecessary.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (d) “haven’t to go” is a Structural Error. (c) “wouldn’t” is a Meaning Trap.
14 (c) mustn’t
- Why it is correct: Taking the allergy lightly leads to mistakes. The doctor strictly prohibits this attitude.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (d) “mustn’t to take” is a Structural Error. (b) “shouldn’t” is a Meaning Trap.
15 (d) don’t have to
- Why it is correct: The doctor is reassuring the patient that living in fear and staying inside is not a requirement.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake (grammatically possible, but “don’t have to” perfectly conveys the removal of an extreme, unnecessary burden). (b) “not have to” is a Structural Error. (c) “couldn’t” is a Meaning Trap.
16 (b) mustn’t
- Why it is correct: Assuming a cookie is safe without asking can cause a severe reaction.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (c) “mustn’t assuming” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
17 (c) mustn’t
- Why it is correct: Being shy prevents people from helping you. You are ordered not to hide it.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (b) “don’t must” is a Structural Error. (d) “needn’t” is a Meaning Trap.
18 (a) mustn’t
- Why it is correct: Testing the allergy yourself is intentionally triggering a medical crisis. It is absolutely forbidden.
- Distractor Analysis: (b) “don’t have to” is a Common Mistake. (d) “mustn’t to test” is a Structural Error. (c) “aren’t supposed” is a Structural Error (needs “to test”).
19 (c) don’t have to
- Why it is correct: Routine visits are only annual, meaning there is no obligation to come back sooner unless there’s an emergency.
- Distractor Analysis: (a) “mustn’t” is a Common Mistake. (b) “haven’t to” is a Structural Error. (d) “shouldn’t” is a Meaning Trap.
20 (d) mustn’t
- Why it is correct: Letting your guard down is the ultimate risk. The doctor commands constant vigilance.
- Distractor Analysis: (a) “don’t have to” is a Common Mistake. (b) “don’t must” is a Structural Error. (c) “shouldn’t” is a Meaning Trap.
GRAMMAR POINTS TO REMEMBER
1 MUSTN’T (The Life-or-Death Prohibition):
- Meaning: It is strictly forbidden. In a medical context, doing this action will cause severe harm, illness, or death. You have zero permission and no choices.
- Medical Examples: You mustn’t eat peanuts. You mustn’t forget your EpiPen. You mustn’t wait if your throat swells.
- Structure: Subject + mustn’t + Verb (bare infinitive). (Never use “to”).
2 DON’T HAVE TO (The Absence of Necessity):
- Meaning: It is NOT required. You are not forced to do this. It is safe to skip this action because it is unnecessary or someone else has taken care of it.
- Medical Examples: You don’t have to stay locked inside. You don’t have to pay for the EpiPen (it’s free).
- Structure: Subject + don’t/doesn’t have to + Verb (bare infinitive).
The Doctor’s Rule of Thumb: If an action will hurt or kill you, the doctor will use MUSTN’T. If an action is just unnecessary stress or effort, the doctor will use DON’T HAVE TO.