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