Asian teacher speaks to students.
The teacher is Caucasian.
Asian is not Caucasian.
exists e1 s1 x1 x2.(to(e1,x2) & n_student(x2) & Actor(e1,x1) & v_speak(e1) & n_teacher(x1) & a_asian(s1) & Theme(s1,x1))
exists s1 x1.(n_teacher(x1) & Theme(s1,x1) & a_caucasian(s1))