A snowboarder jumps across a snowy hill.
A snowboarder doing a flip.
Jumping across does not necessarily mean doing a flip.
exists e1 s1 x1 x2.(across(e1,x2) & n_hill(x2) & a_snowy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_jump(e1) & n_snowboarder(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_flip(x3) & (x1 = x2) & n_snowboarder(x1))