a) writing b) written.
a) singing b) sung.
a) washing b) washed.
a) doing b) done.
a) surrounded b) surrounding.
translated.
visited.
lying.
bought.
organized.
taking.
lost.
painted.
received.
playing.
written.
written.
covered.
lost.
going.
gathered.
blown.
turning.
coming.
standing.