He enjoys sit-skiing in the mountains.

She sit-skied down the mountain.

Sit-skiers glide down the slopes with ease.

The sit-skier glided down the slope with ease.

The dog sits on the couch.

The neighbor's cat sits on the fence.

She house-sits for her neighbors when they go on vacation.

The cat sits on the mat.

The dog sits on the mat.

She pet-sits for her neighbors when they go on vacation.