A teacher is giving a lecture.
The teacher is speaking to the class.
Giving a lecture requires speaking to a class
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_lecture(x2) & n_teacher(x1))
exists e1 x1 x2.(n_class(x2) & n_teacher(x1) & to(e1,x2) & Actor(e1,x1) & v_speak(e1))