how to change this sentence from direct speech to reported speech.' Jack told,"I'll lend you my grammar book if you think it will help" '

I will lend you my grammar book if that will help.

When we tell someone what another person said we use reported speech. For this, we can use direct speech or indirect speech. For exmaple, in reported statements, we can use either 'say' or 'tell'. These meaning is the same, but the grammar is different.

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