A person on a surfboard in the ocean.
The infant is crawling on a floor.
AN INFANT CRAWLING ON A FLOOR IS NOT ON A SURFBOARD IN THE OCEAN
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & on(x1,x2) & in(x2,x3) & n_surfboard(x2) & n_person(x1))
exists e1 x1 x2.(n_infant(x1) & on(e1,x2) & n_floor(x2) & Actor(e1,x1) & v_crawl(e1))