A man on a surfboard navigates waves in the ocean.
The man on the surfboard is taking a big wave.
Specifies that there is a singular wave that the man is riding
exists e1 x1 x2 x3 x4.(n_ocean(x4) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_navigate(e1) & n_wave(x3) & on(x1,x2) & n_surfboard(x2) & n_man(x1))
exists e1 s1 x1 x2 x3.(n_surfboard(x2) & n_man(x1) & Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_wave(x3) & a_big(s1) & Theme(s1,x3) & on(x1,x2))