Question

d) Do they have to do the activity? Eles têm que fazer a atividade?
Na forma Afirmativa fica:
Na forma negativa fica:​

Answer 1

They have to do the activity (afirmativa)
They don’t have to do the activity (negativa)

Answer 2

AFIRMATIVA: They have to do the activity.

NEGATIVA: They don't have to do the activity.

ou "They do not have to do the activity".