A middle-aged man and woman walking in a museum.
The couple was happy.
They may not be a couple, and they may not be happy.
exists s1 s2 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & in(x2,x4) & n_museum(x4) & n_walking(x2) & of(x2,x3) & n_woman(x3) & subset_of(x1,s1) & n_man(x1) & a_middle-aged(s2) & Theme(s2,x1))
exists s1 x1.(n_couple(x1) & Theme(s1,x1) & a_happy(s1))