Final answer:
This question is about using the modals 'have to' and 'must' to express obligation or necessity in English.
Step-by-step explanation:
1. Today is a holiday. I don't have to go to work.
2. I need to go to the post office now.
3. My mother has to see a doctor because she isn't feeling well.
4. I have to answer my phone.
5. A: Do they have to leave soon? B: Yes, they have to drive to the store.
6. Patrick doesn't have to take a bus. He can drive to the store.
7. Anne needs to take a driving test this afternoon.
8. Excuse me, I must see a dentist. She has an appointment.
9. My friend has to bring food and water into space.
10. My sister doesn't have to drink water for a long time.
11. Camels can go a long time without drinking water.
12. My sister needs to study for the grammar test tomorrow.
13. Astronauts must bring food and water into space.
14. A: Does he have to study now? B: Yes, he has to make so much noise?
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