A couple share wine and dinner.
A husband and wife share wine and dinner.
Not all couples are husband and wife.
exists s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x4,s1) & n_dinner(x4) & subset_of(x1,s1) & n_wine(x1) & of(x1,x3) & n_share(x3) & of(x1,x2) & n_couple(x2))
exists s1 x1 x2 x3 x4 x5 x6.(a_topic(s1) & subset_of(x2,s1) & subset_of(x6,x2) & n_dinner(x6) & subset_of(x3,x2) & Time(x3,x5) & n_wine(x5) & Time(x3,x4) & n_share(x4) & n_wife(x3) & subset_of(x1,s1) & n_husband(x1))