A woman looking at a man's computer screen.
A woman having a conversation with her colleague.
Just because a woman is looking at a man's computer screen does not infer that she is having a conversation with her colleague.  She could be looking at the computer screen and not conversing at all.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & at(e1,x4) & n_screen(x4) & of(x4,x5) & n_computer(x5) & of(x4,x3) & n_man(x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_have(e1) & with(x3,x4) & n_colleague(x4) & of(x4,x1) & n_female(x1) & n_conversation(x3) & (x1 = x2) & n_woman(x1))