an African boy drives his team of oxen down a dirt road.
An African boy prepares tacos.
One cannot be driving a team of oxen and preparing tacos simultaneously.
exists e1 s1 x1 x2 x3 x4 x5.(down(e1,x4) & n_road(x4) & of(x4,x5) & n_dirt(x5) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & of(x2,x3) & n_ox(x3) & n_team(x2) & of(x2,x1) & n_male(x1) & n_boy(x1) & a_african(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_prepare(e1) & n_taco(x2) & n_boy(x1) & a_african(s1) & Theme(s1,x1))