Two young boys are sitting in a canoe, the one in the foreground is holding a medium sized fish.
A boy caught a fish while in a boat.
Tow young boys sitting in a canoe, does not infer that they were in a boat.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4.(n_foreground(x3) & Theme(e2,x4) & Actor(e2,x1) & v_hold(e2) & n_fish(x4) & a_sized(s3) & Theme(s3,x4) & a_medium(s2) & Theme(s2,x4) & in(x1,x3) & n_thing(x1) & card_eq_1(x1) & in(e1,x2) & n_canoe(x2) & Actor(e1,x1) & v_sit(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_boat(x3) & r_while(e1) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_fish(x2) & n_boy(x1))