A man walking a boy across the street, as a man on a bike is crossing.
The man on the bike sees the other man with the boy.
A man crossing does not imply the man sees another man.
exists e1 p1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & exists e2 x5 x6.(Actor(e2,x5) & v_cross(e2) & on(x5,x6) & n_bike(x6) & n_man(x5)) & as(e1,p1) & across(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_walk(e1) & n_boy(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_boy(x4) & -(x3 = x1) & n_man(x1) & n_man(x1) & n_man(x3) & n_bike(x2) & Theme(e1,x3) & Actor(e1,x1) & v_see(e1) & with(x3,x4) & on(x1,x2))