frequencies([sentence([a,turtle,sleeps], [])-5, sentence([the,turtle,sleeps], [])-3, sentence([the,turtles,sleep], [])-2]).

%%%sentence([a,turtle,sleeps], []).
%%%sentence([the,turtle,sleeps], []).
%%%sentence([the,turtles,sleep], []).

%%%  sentence(X, []).
%%%  X = [a,turtle,sleeps] ? ;
%%%  X = [the,turtle,sleeps] ? ;
%%%  X = [the,turtles,sleep] ? ;
%%%  no