People are walking by an all gray statue.
A group of students are walking past a statue.
The people walking has not be identified as students.
exists e1 s1 x1 x2.(by(e1,x2) & n_statue(x2) & a_gray(s1) & Theme(s1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(past(e1,x3) & n_statue(x3) & Actor(e1,x1) & v_walk(e1) & of(x1,x2) & n_student(x2) & n_group(x1))