A large group of people watch a presentation on a projector screen.
A big group of people were watching a presentation on the projector screen.
Here a big group of people refers to a large group of people watching a presentation on a projector screen
exists e1 s1 x1 x2 x3 x4 x5.(on(e1,x4) & n_screen(x4) & of(x4,x5) & n_projector(x5) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & n_presentation(x3) & of(x1,x2) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_screen(x4) & of(x4,x5) & n_projector(x5) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & n_presentation(x3) & of(x1,x2) & n_people(x2) & n_group(x1) & a_big(s1) & Theme(s1,x1))