Conceptual Entity Relationship diagram

I am struggling to draw conceptual ER diagram for following question, can anybody please suggest

There are fields to plough, tractors to do the plowing, and farmer to ride the tractors.
When all three factors come together, some work is accomplished. Attributes for a eld
are fName and area; of a tractor, tName and horsepower; of a farmer, faName and age.
None of these are unique