doctor
The Italian word for doctor is 'dottore'. This is a masculine noun, and in the same way as English, it is used to refer to a medical professional. You can also use it in various sentence contexts such as 'Il dottore è qui' which means 'The doctor is here'.
I have an appointment with the doctor at ten.
This sentence is used when you have a scheduled appointment with a doctor. 'Ho appuntamento con il dottore alle dieci' means you have a meeting at 10 o'clock.
Doctor, I feel sick.
None
The doctor said that everything is fine.
This phrase is often used after a doctor's check up when you're reporting the outcome. 'Il dottore ha detto che tutto va bene' means the doctor said that everything is okay.