A man holding a sign and a man playing a guitar are speaking in front of a crowd.
A man with a sign and his brother, who plays the guitar, are giving a speech in front of an audience.
Answer :The fact that they are speaking In front of a crowd does not necessarily imply that they are giving a speech in front of an audience.
exists e1 e3 e2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(in(e3,x8) & of(x8,x9) & n_crowd(x9) & n_front(x8) & Actor(e3,x1) & v_speak(e3) & Theme(e2,x3) & Actor(e2,x2) & v_hold(e2) & subset_of(x5,x3) & Theme(e1,x7) & Actor(e1,x6) & v_play(e1) & n_guitar(x7) & (x5 = x6) & n_man(x5) & subset_of(x4,x3) & n_sign(x4) & (x1 = x2) & n_man(x1))
exists e1 e2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_guitar(x6) & Theme(e2,x7) & Actor(e2,x1) & v_give(e2) & in(x7,x8) & of(x8,x9) & n_audience(x9) & n_front(x8) & n_speech(x7) & with(x1,x2) & subset_of(x4,x2) & Theme(e1,x6) & Actor(e1,x5) & v_play(e1) & (x4 = x5) & n_brother(x4) & of(x4,x1) & n_male(x1) & subset_of(x3,x2) & n_sign(x3) & n_man(x1))