A man in a green button-down shirt sings into a microphone.
A nicely dressed man makes a speech into a microphone.
A man at a microphone does not necessarily imply that he makes a speech.
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & into(x1,x4) & n_microphone(x4) & in(x1,x2) & n_sing(x2) & of(x2,x3) & n_shirt(x3) & a_button-down(s2) & Theme(s2,x2) & a_green(s1) & Theme(s1,x2) & n_man(x1))
exists e1 e2 x1 x2 x3.(into(e2,x3) & n_microphone(x3) & Theme(e2,x2) & Actor(e2,x1) & v_make(e2) & n_speech(x2) & n_man(x1) & Theme(e1,x1) & v_dress(e1) & r_nicely(x1))