A man is standing at a desk about to speak.
A man is standing at a desk about to speak to the students.
Just because a man is standing doesn't mean he is about to speak to students.
exists e1 p1 s1 x1 x2 x3.(Topic(e1,p1) & a_about(s1) & Manner(p1,s1) & exists e2.(Actor(e2,x1) & v_speak(e2)) & at(e1,x3) & n_desk(x3) & Actor(e1,x2) & v_stand(e1) & n_man(x2) & n_man(x1))
exists e1 p1 s1 x1 x2 x3 x4.(n_student(x4) & Topic(e1,p1) & a_about(s1) & Manner(p1,s1) & exists e2.(to(e2,x4) & Actor(e2,x1) & v_speak(e2)) & at(e1,x3) & n_desk(x3) & Actor(e1,x2) & v_stand(e1) & n_man(x2) & n_man(x1))