A man is riding his bicycle up in the air off of a ramp.
A man is riding a skateboard.
He couldn't ride a bicycle and skateboard at the same time
exists e1 s1 x1 x2 x3 x4.(n_air(x3) & of(e1,x4) & n_ramp(x4) & r_off(e1) & in(e1,x3) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bicycle(x2) & of(x2,x1) & n_male(x1) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_man(x1))