A boy and a girl are walking in a mall.
A man walking a dog outside
A man is not a boy and a girl while walking a dog outside can not take place while walking in a mall.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_mall(x4) & Actor(e1,x1) & v_walk(e1) & subset_of(x3,x1) & n_girl(x3) & subset_of(x2,x1) & n_boy(x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_outside(x3) & of(x3,x4) & n_dog(x4) & (x1 = x2) & n_man(x1))