6. Mary said, “I have been here for a few days. ” Mary said 7. Mr. Pike said to Daisy, “I didn’t meet your father yesterday.” Mr. Pike said

6. Mary said that she had been here for a few days. ( Câu gián tiếp biến đổi từ thì hiện tại hoàn thành sang thì quá khứ hoàn thành ) 

7. Mr. Pike said that he hadn't met Daisy's father the day before/the previous day. ( Câu gián tiếp biến đổi từ thì quá khứ đơn sang quá khứ hoàn thành, yesterday = the day before/the previous day )