He slapped her across the face with the back of his hand.

I slapped him across the face with my left hand.

She got her right hand free and slapped him across the face.

The Boy came forward and slapped him across the face.

The man slapped him across the face with the back of his hand.

He might as well have slapped her across the face.

He brought up his hand and slapped her across the face.

Then he slapped himself across the face, good and hard.

She looked as if he had slapped her across the face.

I felt as though I'd been slapped across the face.