A man standing by a yellow sign.
There is a yellow sign.
Both sentences are in a yellow sign
exists s1 x1 x2 x3.(a_topic(x1) & by(x1,x3) & n_sign(x3) & a_yellow(s1) & Theme(s1,x3) & n_standing(x1) & of(x1,x2) & n_man(x2))
exists p1 x1 s1 x2.((x1 = x2) & n_sign(x2) & a_yellow(s1) & Theme(s1,x2))