A man and a woman sitting by the water.
The man and woman are talking to each other.
Sitting by the water doesn't always mean talking to each other.
exists e1 s1 x1 x2 x3 x4.(n_water(x4) & a_topic(s1) & subset_of(x2,s1) & by(e1,x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 x1 x2 x3.(n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & all x4.(n_other(x4) -> to(e1,x4)) & Actor(e1,x1) & v_talk(e1))