Girl giving school presentation.
A girl is giving a presentation.
A girl  giving a presentation does just that.
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.(Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & n_girl(x1))