There is no advantage in doing that.

What do you say to doing the sights of Tokyo tomorrow?

What do you think you're doing letting the loyalists into the castle?

Not doing one's work properly may be worse than not doing it at all.

I feel like I'm always doing nothing but doing chores.

That was a nifty way of doing it.

She was doing the washing then.

He is doing physics.

He is doing penance.

What is he doing?