A boy in speedos, wading through a lake.
Someone is present in the lake.
The boy is not necessarily the same as someone.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & through(e1,x4) & n_lake(x4) & Actor(e1,x3) & v_wade(e1) & (x2 = x3) & n_speedo(x2) & n_boy(x1))
exists s1 x1 x2.(n_lake(x2) & in(s1,x2) & Theme(s1,x1) & a_present(s1) & n_person(x1))