A smiling boy swims underwater in a pool.
A girl is skating
A boy that is swimming is a male underwater and a girl that is skating would be a female on land, one person can't be in both locations as two genders simultaneously.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_pool(x4) & n_underwater(x1) & of(x1,x3) & n_swim(x3) & of(x1,x2) & n_boy(x2) & Actor(e1,x1) & v_smile(e1))
exists e1 x1.(Actor(e1,x1) & v_skate(e1) & n_girl(x1))