What just happened?
The car has just broken down.
What is he doing?
He is doing an experiment.
What is he doing?
He is having an operation.
What is she doing?
She is rebooting the computer.
What just happened?
The car has run out of petrol.
What are they doing?
Theay are switching it on and switching off.
What is he doing?
He is pressing the button.
What is she doing?
She is pluging it in.
What is she doing?
She is having an injection.