vacuuming 
This floor can only use the vacuuming to clean.

walking the dog 
Between one and two I was doing the shopping and walking the dog.

ironing
She was ironing and she paused and looked at me with tears in her eyes.

mowing the lawn
I spent the whole afternoon mowing the lawn in the back yard.

baby-sitting
She and her sister took turns at baby-sitting.

grocery shopping
He asked me to go grocery shopping.