Question

Tomba said," I have lost my book"

Answer 1

Direct Speech: Tomba said," I have lost my book"

Indirect speech: Tomba told that he has lost his book.

Answer 2

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Tomba said that he had lost his book.

Extra Information :

If the reporting verb introducing direct speech is in the past tense, the verb in the reported speech must be changed into the corresponding past tense.

As we can see in the given answer, the present perfect tense is converted into the past perfect tense.