play hide-and-seek
play on the seesaw
jump rope
ride a horse
ride a horse => Ving
riding a horse
play on the seesaw => Ving
playing on the seesaw
jump rope => Ving
jumping rope
play hide-and-seek
playing hide-and-seek
What are they doing?
They are playing hide-and-seek.
What is she doing?
She is jumping rope.
