People are sitting at every table in a cafe.
People are sitting in a caf.
"sitting in a cafe" is a simpler version of "sitting at every table in a cafe".
exists e1 x1.(all x2.(n_table(x2) -> exists x3.(in(e1,x3) & n_cafe(x3) & at(e1,x2))) & Actor(e1,x1) & v_sit(e1) & n_people(x1))
exists e1 x1 x2.(in(e1,x2) & n_caf(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))