Answers

2014-02-22T19:57:38+05:30
She has been sleeping for the last four hours. or since 5 o clock. Use" since " to mention the starting point of time and "for "the duration of time or 
Ex i have been studying in this school for the last five years or i have been studying in this school since 2009

Prejudice over is wrong. prejudice to something is correct
0