Girl giving school presentation.
A boy is telling jokes to the class.
A girl giving a presentation is a different activity to a boy telling jokes.
exists e1 x1 x2 x3.(ne_nam_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & of(x2,x3) & n_school(x3))
exists e1 x1 x2 x3.(n_class(x3) & Theme(e1,x2) & Actor(e1,x1) & v_tell(e1) & to(x2,x3) & n_joke(x2) & n_boy(x1))