A person rides a four-wheeler in the air.
A person is outside.
in a both sentence air and outside are different.
exists e1 x1 x2 x3.(n_air(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_four-wheeler(x2) & n_person(x1))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_person(x1))