A man and a woman are standing on the curb.
A man and a woman stand together on the curb under an umbrella
People can stand on a curb without being under an umbrella.
exists e1 x1 x2 x3 x4.(n_curb(x4) & on(e1,x4) & Actor(e1,x1) & v_stand(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists s1 x1 x2 x3 x4 x5.(n_curb(x4) & a_topic(s1) & subset_of(x2,s1) & on(x2,x4) & under(x4,x5) & n_umbrella(x5) & r_together(x2) & n_stand(x2) & of(x2,x3) & n_woman(x3) & subset_of(x1,s1) & n_man(x1))