Question

I said to her"when will you return my book"

Answer 1

Answer:

I asked her that when would she return my book

Answer 2

Answer:

The Correct Answer would be I asked her that when would she be returning my book.

Explanation:

As there is nothing mentioned in the question that what do we have to with the question, we'll assume that we have to change this sentence which is in direct speech into indirect speech. There are two forms of speeches in English Grammar, that are basically Direct Speech and Indirect speech. The sentence given in the question is in form of Direct Speech, where we use inverted commas. The sentences we transformed the previous one into is in form of Indirect Speech.