Man is performing a trick with a bicycle on a ramp.
A man performing for a crowd at a skate park.
There isn't necessarily any crowd, and the man is not necessarily at a skate park.
exists e1 x1 x2 x3 x4.(with(e1,x3) & on(x3,x4) & n_ramp(x4) & n_bicycle(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_man(x1))
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & at(e1,x4) & n_park(x4) & of(x4,x5) & n_skate(x5) & for(e1,x3) & n_crowd(x3) & Actor(e1,x2) & v_perform(e1) & (x1 = x2) & n_man(x1))