По языку : поставе к предложениям общий, специальный, разделительный и альтернативные вопросы: 1)you have to call a doctor. 2)they sang a lot of songs. 3) he never does what you tell him.

1)do you have to call a doctor?why do you have to call a doctor? You have to call a doctor,don’t you? Do you have to call a doctor or a vet?
2)did they sing many songs? When did they sing many songs? They sang a lot of songs,didn’t they? Did they sing many songs at the stage or at home?
3)does he always do what you tell him?
Why doesn’t he do what you tell him? He never does what you tell him,does he? Does he always or sometimes do what you tell or him?