sentences:  These public schools reflected the collegiate universities of Oxford and Cambridge, as in many ways they still do, and were accordingly staffed almost entirely by clergymen until the 19th century.Private tuition at home remained the norm for aristocratic families, and for girls in particular, but after the 16th century it was increasingly accepted that adolescents of any rank might best be educated collectively.The institution has thus adapted itself to changing social circumstances over 1,000 years.