She isn't ...
She isn't stepping on the flowers (example)
What's she doing?
She's saving water.
What's she doing?
She's stepping on the flowers
What's she doing?
She's picking up litter.
He isn't ...
He isn't wasting water (example)
She isn't ....
She isn't stepping on the flowers (example)
What's he doing?
He's dropping litter.
What's she doing?
She's planting trees.
What's the cat doing?
The cat's wasting water
The frog isn't ...
The frog isn't dropping litter. (example)