A man and young boy ride in a yellow kayak.
A man and a young boy are in a kayak on a river.
Because they are in a kayak doesn't mean they are on a river.
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_kayak(x4) & a_yellow(s2) & Theme(s2,x4) & n_ride(x1) & of(x1,x3) & n_boy(x3) & a_young(s1) & Theme(s1,x1) & of(x1,x2) & n_man(x2))
exists p1 s1 x1 x2 x3.(exists x4 x5.(in(x1,x4) & on(x4,x5) & n_river(x5) & n_kayak(x4)) & subset_of(x3,x1) & n_boy(x3) & a_young(s1) & Theme(s1,x3) & subset_of(x2,x1) & n_man(x2))