Change the narration to Reported speech and choose the right option :
I said to him, "Do you know when she will go home?"

Question

Accepted Answer

The correct option is 3:

When converting a direct question into indirect or reported speech, several rules must be applied systematically. First, the reporting verb "said to" changes to "asked" or an equivalent, as the sentence is a question. Since the direct speech begins with an auxiliary verb ("Do you know..."), we must introduce "if" or "whether" to connect the reporting clause and the reported clause. Secondly, the tense must be shifted backward: the Present Simple Tense in the reported clause ("Do you know") becomes the Past Simple Tense ("he knew"). Additionally, the modal verb "will" in the embedded question ("when she will go home") changes to its past form, "would." Finally, in reported speech, the structure of the question changes back to that of a statement (Subject + Verb), eliminating the question mark. Option 3, "I asked him if he knew when she would go home," correctly incorporates all these necessary transformations, resulting in grammatically sound reported speech.

The incorrect option is 1:
This option incorrectly retains the future tense "will go home" instead of shifting it to "would go home." Furthermore, retaining the question mark at the end is incorrect for reported speech, which takes the form of a statement.

The incorrect option is 2:
This option incorrectly uses the phrase "said to him that did he knew," which maintains the interrogative structure ("did he knew") and uses the redundant conjunction "that." The Past Simple form of the main verb ("knew") cannot be used with the auxiliary "did" in an affirmative statement structure.

The incorrect option is 4:
This option incorrectly uses the conjunction "that" and maintains the incorrect interrogative structure in the main clause ("did he know"). It also fails to apply sequence of tenses in the embedded question by keeping the incorrect word order "when will she go home?".