Man gives a speech before a conference audience.
a man speaking to an audience
A man must be speaking to an audience in general to be speaking to any specific type of audience.
exists e1 x1 x2 x3 x4.(before(e1,x3) & n_audience(x3) & of(x3,x4) & n_conference(x4) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_speech(x2) & n_man(x1))
exists x1 x2 x3.(a_topic(x1) & to(x1,x3) & n_audience(x3) & n_speaking(x1) & of(x1,x2) & n_man(x2))