A man on a mountain bike is rolling down a mild hill.
The man is playing basketball.
The man cannot be both playing basketball and rolling down a hill.
exists e1 s1 s2 x1 x2 x3 x4.(a_down(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x1) & v_roll(e1) & n_hill(x4) & a_mild(s1) & Theme(s1,x4) & on(x1,x2) & n_bike(x2) & of(x2,x3) & n_mountain(x3) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_basketball(x2))