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.

Let me give you an example:  entity: arm 
before: free 
after: grasped 
attr: state
The answer to this example can be: state of arm was free before and grasped afterwards
Here is why: The attribute state of the entity arm was free before and afterwards it was grasped hence the output.

OK. solve this:
entity: the chervil 
before: seed 
after: plant 
attr: state
Answer:
state of the chervil was a seed before and a plant afterwards