A swimmer doing a flip in the air.
The swimmer is in a race.
A swimmer doing a flip need  not necessarily be in a race.
exists e1 x1 x2 x3 x4.(n_air(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & in(x3,x4) & n_flip(x3) & (x1 = x2) & n_swimmer(x1))
exists p1 x1.(n_swimmer(x1) & exists x2.(in(x1,x2) & n_race(x2)))