TASK DEFINITION: Given an entity, a before event, an after event, and an attribute related to the entity, generate a sentence as output. Your sentence should show the changes in the attribute of the entity.
PROBLEM: entity: list of snowboard instructors
before: absent
after: created
attr: state

SOLUTION: state of list of snowboard instructors was absent before and created afterwards

PROBLEM: entity: balls
before: bare
after: covered
attr: state

SOLUTION: state of balls was bare before and covered afterwards

PROBLEM: entity: piece of tin foil
before: flat
after: in ball
attr: shape

SOLUTION:
shape of piece of tin foil was flat before and in a ball afterwards