A skateboard rides up the ramp and does a trick in midair.
A robotic skateboard does tricks for a crowd.
A skateboard need not be robotic and does not imply the trick is done for the crowd.
exists e1 e2 s1 x1 x2 x3 x4 x5.(n_ramp(x2) & in(e2,x5) & n_midair(x5) & Theme(e2,x4) & Actor(e2,x3) & v_do(e2) & n_trick(x4) & n_skateboard(x3) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x1))
exists e1 s1 x1 x2 x3.(for(e1,x3) & n_crowd(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_skateboard(x1) & a_robotic(s1) & Theme(s1,x1))