A girl is making a painting on the sidewalk with people watching
Nobody is painting
The remark of nobody painting contradicts the mention of the Girl painting on the sidewalk in first sentence.
exists e1 e2 x1 x2 x3 x4.(n_sidewalk(x3) & Actor(e2,x4) & v_watch(e2) & with(e1,x4) & n_people(x4) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & n_painting(x2) & n_girl(x1))
-exists p1 x1.(exists x2.((x1 = x2) & n_painting(x2)) & n_person(x1))