Several men are sitting by a river conversing with one another while a boat drifts by them.
The men are canoeing on the river today
The men cannot be sitting by the river if they are busy canoeing on it.
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.(n_river(x2) & n_man(x1) & Time(e1,x3) & n_today(x3) & on(e1,x2) & Actor(e1,x1) & v_canoe(e1))