B
C
D
E
100
surf
surfing
100
dance
dancing
100
ride
riding
He is riding his bike.
100
text
texting
200
chat
chatting
200
talk
talking
200
take
taking
200
download
downloading
300
stop
stopping
300
swim
swimming
300
send
sending
300
sit
sitting
400
have
having
400
write
writing
400
wait
waiting
400
shop
shopping