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.
One example:  entity: arm 
before: free 
after: grasped 
attr: state
Solution is here: state of arm was free before and grasped afterwards
Explanation: The attribute state of the entity arm was free before and afterwards it was grasped hence the output.

Now, solve this: entity: mongoose 
before: stationary 
after: moving 
attr: state
Solution:
state of mongoose was stationary before and moving afterwards