Question

Mary said,"I have been writing this essay"

Answer 1

Answer:

Mary said that she had been writing that essay.

Explanation:

$\rightarrow$ We are dealing with narration here, where direct narration is converted into indirect narration.

$\rightarrow$ I=she.

$\rightarrow$ This =that.

$\rightarrow$ Tense was changed accordingly (present perfect continous to past perfect continous tense).