1.define the objects and people.
a.a postman/person/to bring...
a postman is a person who bought letter´s.
b.a city map/thing/to show where the streets are
a city map things a show where the streets are.
c.a doctor/person/to examine...
a doctor is a person who examines a patient.
d.a bookshop/place/to buy...
a bookshop places bought a book.
e.a flat/place/to live
a flat places lives.
f.a grocer/person/to sell...
a grocer is a person who sold food.