The boy is jumping in the air.
A boy is jumping.
A boy can only be jumping in the air.
exists e1 x1 x2.(n_air(x2) & n_boy(x1) & in(e1,x2) & Actor(e1,x1) & v_jump(e1))
exists e1 x1.(Actor(e1,x1) & v_jump(e1) & n_boy(x1))