Person sitting at a desk in a library.
A human sitting
A person is a human.
exists e1 x1 x2 x3.(ne_nam_person(x1) & in(e1,x3) & n_library(x3) & at(e1,x2) & n_desk(x2) & Actor(e1,x1) & v_sit(e1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_human(x1))