A person reads to a group of boys.
A teacher reads to his students.
Not every person reading is a teacher.
exists e1 x1 x2 x3.(to(e1,x2) & of(x2,x3) & n_boy(x3) & n_group(x2) & Actor(e1,x1) & v_read(e1) & n_person(x1))
exists e1 x1 x2.(to(e1,x2) & n_student(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_read(e1) & n_teacher(x1))