A man lectures a roomful of people using a You Tube video on a projector screen.
The man is sitting at his desk in silence.
A person who lectures is usually not sitting, they are standing. Also, the man who lectures cannot simultaneously be silent.
exists e1 e2 p1 x1 x2 x3 x4 x5.(Theme(e2,x2) & Actor(e2,x1) & v_lecture(e2) & of(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_use(e1) & exists e3 x6 x7 x8.(on(e3,x7) & n_screen(x7) & of(x7,x8) & n_projector(x8) & Theme(e3,x6) & Actor(e3,x1) & v_tube(e3) & n_video(x6)) & n_person(x1) & that(x5,p1) & n_a(x5) & (x3 = x4) & n_people(x3) & n_roomful(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_desk(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & in(e1,x3) & n_silence(x3) & at(e1,x2) & Actor(e1,x1) & v_sit(e1))