The father said to his daughter, "When will you return?"
In Reported Speech the above sentence will be:
The father asked his daughter

Question

Accepted Answer

In the given question, we are tasked with converting a direct speech sentence into reported speech. The original sentence is: "The father said to his daughter, 'When will you return?'"

To convert this into reported speech, we need to follow certain grammatical rules:

1. **Change of Pronouns**: The pronoun "you" in the direct speech refers to the daughter. In reported speech, it changes to "she."

2. **Change of Tense**: In reported speech, the tense of the verb often changes. Since the reporting verb "said" is in the past tense, the future tense "will" in the direct speech changes to "would" in reported speech.

3. **Change of Sentence Structure**: In reported speech, questions are typically converted into statement form. Therefore, the structure changes from "When will you return?" to "when she would return."

Now, let's analyze why Option 4 is correct and why the other options are incorrect:

1. **Option 4: "when she would return."**  
   - This option correctly applies all the rules of converting direct speech to reported speech. The pronoun "you" is changed to "she," the future tense "will" is changed to "would," and the question form is converted into a statement form. This makes Option 4 the correct choice.

2. **Option 1: "when she would return?"**  
   - This option incorrectly retains the question mark at the end, which is not appropriate in reported speech. In reported speech, the sentence should be in statement form, not question form.

3. **Option 2: "when would she return?"**  
   - This option incorrectly maintains the question structure by placing "would" before "she," which is typical of direct questions. In reported speech, the sentence should be in statement form, with "she would" instead of "would she."

4. **Option 3: "when she will return."**  
   - This option fails to change the future tense "will" to "would," which is necessary when the reporting verb is in the past tense. Therefore, it does not correctly follow the rules of tense change in reported speech.

In conclusion, Option 4 is the correct answer because it accurately reflects the necessary changes in pronouns, tense, and sentence structure required for converting direct speech into reported speech.