A man is on stage singing, while the band plays behind him.
A man is entertaining people.
A man can sing on stage with a band behind, but not be entertaining people.
exists p1 p2 x1 x4.(n_male(x4) & n_band(x4) & exists e1.(behind(e1,x4) & Actor(e1,x4) & v_play(e1)) & while(p1,p2) & exists x2 x3.(on(x1,x2) & n_singing(x2) & of(x2,x3) & n_stage(x3)) & n_man(x1))
exists p1 x1.(exists s1 x2.((x1 = x2) & n_people(x2) & a_entertaining(s1) & Theme(s1,x2)) & n_man(x1))