A man with a red helmet kayaking.
A man is kayaking in the river.
A man kayaking does this in the river.
exists s1 x1 x2 x3.(a_topic(x1) & with(x1,x2) & n_kayaking(x2) & of(x2,x3) & n_helmet(x3) & a_red(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_river(x2) & in(e1,x2) & Actor(e1,x1) & v_kayake(e1) & n_man(x1))