One person kayaks as another kayer sinks their boat.
A couple of people Kayaking
It isn't true that a couple of people are kayaking because only one is paddling while another sinks their boat.
exists e1 x1 x2 x3 x4 x5.(n_boat(x5) & of(x5,x3) & n_thing(x3) & n_kayer(x3) & Theme(e1,x5) & Actor(e1,x1) & v_sink(e1) & as(x1,x4) & n_kayer(x4) & -(x4 = x3) & Time(x1,x2) & n_kayak(x2) & n_person(x1) & card_eq_1(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_kayake(e1) & (x1 = x3) & of(x1,x2) & n_people(x2) & n_couple(x1))