Modal Verbs (must / have to / should) – B1 Grammar Test
This B1 grammar test focuses on modal verbs (must / have to / should), which are frequently tested in IELTS, TOEFL, and YDS, especially in questions about rules, obligations, and advice.
Choose the correct answer.
RESULTS
#1. You ___ wear a helmet when riding a motorcycle. It’s the law.
#2. I’m very tired. I think I ___ go to bed early.
#3. Students ___ bring their ID cards to the exam.
#4. I ___ finish this report today because my boss asked me to.
#5. You ___ eat more vegetables if you want to be healthy.
#6. Employees ___ follow the company rules.
#7. You ___ talk loudly in the library.
#8. I ___ work late today. There is no meeting.
#9. Drivers ___ stop at a red light.
#10. You look sick. You ___ see a doctor.
#11. We ___ pay the bill before leaving the restaurant.
#12. You ___ be careful when crossing the street.
#13. Visitors ___ smoke inside the building.
#14. I ___ wear a uniform at my job. It’s not required.
#15. You ___ finish the exam in 60 minutes.
✅ Answer Key with VERY DETAILED EXPLANATIONS
🧠 IELTS · TOEFL · YDS Focused
🧠 Critical Exam Rule (READ THIS FIRST)
| Modal | Meaning | Exam Logic |
|---|---|---|
| must | strong obligation / rule | YDS & IELTS |
| have to | external obligation | IELTS & TOEFL |
| should | advice / suggestion | IELTS Speaking |
| mustn’t | prohibition | YDS classic |
| don’t have to | no obligation | High-value trap |
1. You must wear a helmet…
Law / rule → must
📌 YDS regulation sentences.
2. I think I should go to bed early.
Personal advice → should
3. Students must bring their ID cards…
Exam rule → must
4. I must finish this report today…
Strong obligation from authority.
5. You should eat more vegetables…
Advice, not obligation.
📌 IELTS Speaking health advice.
6. Employees have to follow the company rules.
External rule → have to
7. You mustn’t talk loudly in the library.
Prohibition → mustn’t
🔥 YDS favorite contrast: mustn’t ≠ don’t have to.
8. I don’t have to work late today.
No obligation.
9. Drivers must stop at a red light.
Traffic law → must
10. You should see a doctor.
Suggestion → should
11. We must pay the bill…
Strong obligation.
12. You should be careful…
Advice / warning.
13. Visitors mustn’t smoke inside the building.
Strict prohibition.
14. I don’t have to wear a uniform…
Not required.
📌 YDS trap sentence.
15. You must finish the exam in 60 minutes.
Exam rule → must
🧠 EXAM SURVIVAL SUMMARY
Remember:
must = rule / strong obligation
have to = external rule
should = advice
mustn’t = prohibition
don’t have to = no obligation
Exam focus:
YDS: must vs mustn’t vs don’t have to
IELTS: advice vs obligation
TOEFL: context-based modal choice
