A lady is giving a presentation to an all-female class.
A group of women are gathered in a classroom to observe a speaker.
An all-female class would be comprised of a group of women.  The speaker is a lady.  A classroom would be used if a lady were giving a presentation.
exists e1 s1 x1 x2 x3.(to(e1,x3) & n_class(x3) & a_all-female(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_presentation(x2) & n_lady(x1))
exists e1 p1 x1 x2 x3 x4 x5.(Topic(e1,p1) & exists e2 x6.(Theme(e2,x6) & Actor(e2,x1) & v_observe(e2) & n_speaker(x6)) & in(e1,x5) & n_classroom(x5) & Theme(e1,x3) & v_gather(e1) & of(x3,x4) & n_woman(x4) & n_group(x3) & of(x1,x2) & n_woman(x2) & n_group(x1))