38. Grammar - Answer Key
Part A
1. You must wear a helmet when riding a bike. It's the law.
"Must" karena merupakan aturan/hukum yang tidak bisa ditawar-tawar.
2. I have to finish this report tonight. My boss needs it tomorrow.
"have to" karena kewajiban eksternal (bos membutuhkannya).
3. She looks tired. She should take a break.
"should" karena ini merupakan saran/rekomendasi.
4. Students have to bring their ID cards to enter the exam hall.
"have to" karena ini kewajiban external.
5. You should try this new café! The food is amazing.
"should" karena ini merupakan saran/rekomendasi.
6. He should see a doctor. That cough sounds serious.
"should" karena ini merupakan saran/rekomendasi.
7. We must leave now or we'll miss the train.
"must" karena kedengarannya mendesak, tegas, dan tidak bisa dinegosiasikan/tidak bisa ditawar-tawar.
Pembicara merasakan kebutuhan mendesak untuk segera berangkat agar tidak ketinggalan kereta.
“must” menambahkan rasa ketergesa-gesaan atau tekad yang kuat.
8. My brother has to do his homework before watching TV.
"have/has to" karena ini kewajiban external. Mungkin ayah atau ibunya bilang demikin.
9. You must speak quietly in the library.
Di sebagian besar perpustakaan, "quiet (diam)" merupakan aturan yang ketat — bukan sekadar anjuran yang sopan.
"MUST" mengungkapkan kewajiban yang kuat, yang sering dikaitkan dengan aturan, hukum, atau ekspektasi formal.
10. They have to clean the house today—guests are coming!
"have to" merasa wajib kerena ada pengaruh external, ada tamu mau datang.
Part B
1. I have to go to work tomorrow.
➡️ External obligation (schedule) → have to
2. She had to call her mom last night — it was urgent.
➡️ Past obligation → had to
3. You must not park here. It’s for ambulances only!
➡️ Strong prohibition → must not
4. You don’t have to come if you’re busy.
➡️ No obligation / optional → don’t have to
5. I must start eating healthier.
➡️ Strong internal feeling → must
6. When I was in school, we had to wear shoes inside the classroom.
➡️ Past rule → had to
7. You don’t have to bring your own pen, but it’s better if you do.
➡️ Optional (not necessary) → don’t have to
8. I must stop wasting time on social media.
➡️ Internal obligation → must
9. You must not use your phone during the exam.
➡️ Prohibition → must not
10. I had to study hard for the last exam.
➡️ Past necessity → had to
