What activity is this?
sleep, sleeping
What activity is this?
play the piano, playing the piano
What activity is this?
climb, climbing
What activity is this?
play basketball, playing basketball
What activity is this?
running
What activity is this?
swim, swimming
What activity is this?
play football, playing football
What activity is this?
draw, drawing
What activity is this?
walk, walking
What activity is this?
jump, jumping
What activity is this?
fly a plane, flying a plane