A man and woman share a meal at a table.
The husband and wife are discussing the day over dinner.
You can not infer they are husband and wife.
all x1.(n_meal(x1) -> exists x2 x3 x4 x5.(a_topic(x2) & at(x2,x5) & n_table(x5) & for(x2,x1) & n_share(x2) & of(x2,x4) & n_woman(x4) & of(x2,x3) & n_man(x3)))
exists e1 x1 x2 x3 x4 x5.(n_day(x4) & n_wife(x3) & n_husband(x2) & subset_of(x3,x1) & subset_of(x2,x1) & over(e1,x5) & n_dinner(x5) & Theme(e1,x4) & Actor(e1,x1) & v_discuss(e1))