A black man is playing a guitar while a woman in a dark green coat nearby is looking away.
the man is very good
A man playing a guitar could be skilled or unskilled so it can not be assumed he is very good.
exists e1 p1 s1 x1 x2.(exists e2 p2 s2 s3 s4 x3 x4.(a_nearby(s4) & Manner(e2,s4) & exists s5.(Theme(s5,x3) & a_away(s5)) & Topic(e2,p2) & Actor(e2,x3) & v_look(e2) & in(x3,x4) & n_coat(x4) & a_green(s3) & Theme(s3,x4) & a_dark(s2) & Theme(s2,x4) & n_woman(x3)) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1) & a_black(s1) & Theme(s1,x1))
exists s1 x1.(n_man(x1) & r_very(s1) & Theme(s1,x1) & a_good(s1))