We / not look / after patients.
We aren't looking after patients.
We / put out / fires?
Are we putting out fires?
I / repair / electrical equipment.
I'm repairing electrical equipment.
I / not serve / food.
I'm not serving food.
I / sing / in concerts?
Am I singing in concerts?
She / teach
She is teaching
He / not write / a book.
He isn't writing a book.
He/ catch / fish
He is catching fish.
