How to build a database structure correctly?

Question

Entity Framework

There are the following models:

• duty
  

public class Duty
    {
        public int DutyId { get; set; }

        public int dateId { get; set; }
        public Date DateOfDuty { get; set; }

        public int typeOfDutyId { get; set; }
        public TypeOfDuty typeOfDuty { get; set; }

        public List<DutyOfPerson> DutyPerson { get; set; }
    }

TypeOfDuty

public class TypeOfDuty
    {
        public int typeOfDutyId { get; set; }
        public string Name { get; set; }
        public List<RoleInDuty> rolesInDuty { get; set; }
    }

RoleInDuty

public class RoleInDuty
    {
        public int roleInDutyId { get; set; }
        public string Name { get; set; }
        public int typeOfDutyId { get; set; }
    }

person

public class Person
    {
        public int PersonId { get; set; }
        public string Name { get; set; }
    
        public List<DutyOfPerson> DutyPerson{ get; set; }
    }

I create a connected class Person-Duty:

public class DutyPerson
    {
        public int DutyId { get; set; }
        public Duty Duty { get; set; }
        public int PersonId { get; set; }
        public Person Person { get; set; }
    }

Now it is possible to set the watch, its type and assign people to the watch, but how now to assign a role to a person in this watch?
Approximate database scheme
And also to establish in what duty a person can participate and what roles he can perform (this is secondary). The first is clear how to execute => create a linked table of type PersonTypeOfDuty, but again, how to set what roles it can perform in these duties?