A couple converses at a table in a bar.
A couple has a heated discussion in a bar.
Just because a couple is conversing doesn't mean they are having a heated discussion.
exists e1 x1 x2 x3.(at(e1,x2) & in(x2,x3) & n_bar(x3) & n_table(x2) & Actor(e1,x1) & v_converse(e1) & n_couple(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & in(x2,x3) & n_bar(x3) & n_discussion(x2) & a_heated(s1) & Theme(s1,x2) & n_couple(x1))