A man in a red and black shirt is playing guitar in front of a city.
A man does a concert in the city.
A man playing guitar in front of a city is not necessarily a concert.
exists e1 s1 s2 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_city(x5) & n_front(x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_guitar(x3) & in(x1,x2) & n_shirt(x2) & a_black(s2) & Theme(s2,x2) & a_red(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3.(n_city(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_concert(x2) & n_man(x1))