A man sitting in a park is playing a musical instrument.
A man is bird watching in the park
a man cannot be sitting and watching at the same time.
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & n_instrument(x4) & a_musical(s1) & Theme(s1,x4) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists p1 x1 x2.(n_park(x2) & in(p1,x2) & exists s1 x3.((x1 = x3) & n_watching(x3) & a_bird(s1) & Theme(s1,x3)) & n_man(x1))