Ответ:

  1. I have to go to the doctor.
  2. He doesn’t have to wear a scarf.
  3. Do you have to take the dog out now?
  4. James and Maria have to cook dinner.
  5. They don’t have to vacuum now.
  6. Do you have to learn these words?

Правило: после do/does используется глагол без окончания -s; с he/she/it употребляется doesn’t, а с I/you/we/they — don’t.

Ответ: 1 — have; 2 — doesn’t; 3 — have; 4 — have; 5 — don’t; 6 — Do.