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

entity: needle
before: unthreaded
after: threaded
attr: threaded or not
threaded or not of needle was unthreaded before and threaded afterwards

entity: legs
before: inert
after: moving
attr: speed
speed of legs was inert before and moving afterwards