This man is kayaking in whitewater.
A man is kayaking in rapid water.
this man refer to a man.
exists e1 x1 x2.(n_man(x1) & in(e1,x2) & n_whitewater(x2) & Actor(e1,x1) & v_kayake(e1))
exists e1 s1 x1 x2.(in(e1,x2) & n_water(x2) & a_rapid(s1) & Theme(s1,x2) & Actor(e1,x1) & v_kayake(e1) & n_man(x1))