Small child is rollerskating while bicyclists ride around a track.
A kid reads a book at the library.
A child cannot do rollerskating and read a book at the same time and one cannot be on a track and in the library simultaneously.
exists e1 p1 s1 x1.(exists e2 x2 x3.(around(e2,x3) & n_track(x3) & Actor(e2,x2) & v_ride(e2) & n_bicyclist(x2)) & while(e1,p1) & Actor(e1,x1) & v_rollerskate(e1) & n_child(x1) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_library(x3) & Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & at(x2,x3) & n_book(x2) & n_kid(x1))