-ing

Alyosha: Mama look! I'm Basketballing.

.

Mama: Alyosha be careful!

Alyosha: I'm be carefuling.

.

Mama: Alyosha what are you doing?

Alyosha: I'm trucking. (playing with his trucks)

.

(There is one more but I forgot it! I will add it later...)