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.

entity: calendar date
before: yesterday
after: today
attr: date
date of calendar date was yesterday before and today afterwards

entity: bag
before: flat
after: rounded
attr: shape
shape of bag was flat before and rounded afterwards

entity: items
before: unowned
after: owned
attr: state
state of items was unowned before and owned afterwards