Person sitting at a desk in a library.
The person is sitting indoors.
The person is sitting indoors because they are at a library.
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 p1 x1.(n_person(x1) & exists e1 x2.((x1 = x2) & n_indoor(x2) & Actor(e1,x2) & v_sit(e1)))