A man kayaks through rough water.
This is challenging
Kayaking through rough water is surely a challenging task.
exists e1 s1 x1 x2.(through(e1,x2) & n_water(x2) & a_rough(s1) & Theme(s1,x2) & Actor(e1,x1) & v_kayak(e1) & n_man(x1))
exists e1 x1.(n_thing(x1) & Actor(e1,x1) & v_challenge(e1))