Final answer:
In indirect speech, 'You must make a complaint.' as reported by someone would be 'She said I had to make a complaint.', reflecting the backshift in tense typically required.
Step-by-step explanation:
The sentence 'You must make a complaint.' is being reported in indirect speech, which generally requires a backshift in tense unless the reporting verb is in the present or the statement is still true or relevant. Therefore, the sentence 'She said I must make a complaint.' would typically change to 'She said I had to make a complaint.'
Additional context may influence the exact wording. Here are some examples that demonstrate similar constructions:" Ah, get up and say somethun, anyhow," persisted Marcus; "you ought to do it. It's the proper caper." "But he said I wasn't able to go, nor able to stand it after I got there; and I did not make out a very good case for myself, for I was crying before I had finished.
"You are decided, then, not to comply with my request- -a request made according to common usage and common sense?" "Nay, Aylmer," said Georgiana with the firmness of which she possessed no stinted endowment, "it is not you that have a right to complain. You mistrust your wife; you have concealed the"