Question

That teacher said to the girl,'have you had your lunch? (Change it into reported speech)

Answer 1

The teacher asked the girl whether she had had her lunch.

Answer 2

The teacher asked the girl whether she had her lunch.

Explanation:

• The sentence that is given in direct speech must be changed into indirect.  
• When a sentence is converted into reported form, the comma, question mark and quotation marks must be removed.
• As we have a question inside the quotes, we can replace 'said to the girl' with 'asked the girl'.
• Moreover, the question is a 'yes/no' type. Hence we must use 'whether'.
• The entire sentence is converted into past. That is the verbs take the past tense form. We have the verb 'have' as well as 'had'. When we convert the verb 'have' into past tense, we have 'had' again. It becomes 'had had'. To avoid the repetition of 'had', we can use it once alone.
• So it becomes 'whether she had her lunch'.
• The person within the quotation marks must be changed in reported form accordingly. So 'you' changes into 'she' and 'your' becomes 'her' in reported form.
• So the answer will be: The teacher asked the girl whether she had her lunch.