Several men are sitting by a river conversing with one another while a boat drifts by them.
Men are enjoying their conversation while a canoe floats by.
Just because men are sitting by a river conversing does not mean they are enjoying it also not all boats are a canoe.
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 s1 x1 x2 x3 x4.(a_by(s1) & Manner(e1,s1) & while(e1,x3) & n_float(x3) & of(x3,x4) & n_canoe(x4) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_conversation(x2) & of(x2,x1) & n_thing(x1) & n_man(x1))