1. I have to order a new cookbook today.
2. I have to go to a conference with some colleagues.
3. I should go see my patient with diabetes.
4. Today, Monday, I can see more patients.
B) Ella me hablo is the correct way to say it in past tense. Hope this helps!
Answer:
Ana está comiendo
Yo estoy tomando agua
Uds. están cantando
Paco y yo estamos estudiando
Tú estás mirando/viendo
C . Because comeré means to eat ; and you eat icecream