Q:

“I always keep a tin of biscuits in my room, girls.” 

• 1
  The matron told the girls that she would always keep a tin of biscuits in her room.
• 2
  The matron told the girls that she had kept a tin of biscuits in her room.
• 3
  The matron said that she always keeps a tin of biscuits in her room.
• 4
  The matron informed the girls that she always kept a tin of biscuits in her room.