The man is doing a jump while skiing.
A man is doing ski stunts on a motorcycle.
The man is either jumping in skis or doing stunts on a motorcycle. He cannot do both simultaneously, nor can he ski and ride a motorcycle at the same time.
exists e1 x1 x2 x3.(n_man(x1) & while(e1,x3) & n_skiing(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_jump(x2))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_motorcycle(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_stunt(x2) & a_ski(s1) & Theme(s1,x2) & n_man(x1))