A class of students are raising their hands.
the students are in high school
One cannot assume that the class of students are in high school.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_raise(e1) & n_hand(x3) & of(x3,x1) & n_thing(x1) & of(x1,x2) & n_student(x2) & n_class(x1))
exists p1 x1.(n_student(x1) & exists s1 x2.(in(x1,x2) & n_school(x2) & a_high(s1) & Theme(s1,x2)))