Several men are sitting by a river conversing with one another while a boat drifts by them.
A group of men are talking by a river.
We don't know if a boat drift by the group of men
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6.(by(e1,x2) & by(e2,x1) & n_thing(x1) & while(e2,x5) & n_drift(x5) & of(x5,x6) & n_boat(x6) & with(e2,x4) & n_thing(x4) & card_eq_1(x4) & a_another(s2) & Theme(s2,x4) & Actor(e2,x3) & v_converse(e2) & (x2 = x3) & n_river(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(by(e1,x3) & n_river(x3) & Actor(e1,x1) & v_talk(e1) & of(x1,x2) & n_man(x2) & n_group(x1))