Which alternative is the correct indirect form of the sentence?
He said to me, "When will you come back?"

Correct option is D

Solution: Correct Answer: (d) He asked me when I would go back.
Explanation:
The given sentence is in Direct Speech:
He said to me, “When will you come back?”
To change it into Indirect Speech, follow these steps:
Reporting verb “said to” changes to “asked” because the sentence is a question.
Inverted commas (“ ”) are removed and replaced by ‘when’ (a question word).
Question form (“When will you come back?”) changes into a statement form (word order becomes subject + verb).
Tense change:
will → would (as the reporting verb is in past tense).
Pronoun change:
you (referring to the listener “me”) → I in indirect speech.
Hence, it becomes:
He asked me when I would go back.
Information Booster:
→ In indirect speech of questions, question marks are dropped.
→ If the question begins with a wh-word (when, why, where, how), that word introduces the reported clause.
→ The tense of the question usually shifts one step back in time (will → would, can → could, shall → should).
Additional Knowledge:
If the direct question does not start with a wh-word (e.g., “Are you coming?”), we use if or whether in indirect speech:
He said to me, “Are you coming?”
→ He asked me if I was coming.