The teacher said to the students, "Be polite in your speech."
In Reported Speech the above sentence will be :
The teacher asked the students

Question

Accepted Answer

In the given sentence, "The teacher said to the students, 'Be polite in your speech,'" we need to convert this direct speech into reported speech. The correct transformation involves several key elements, which are addressed in Option 1: "The teacher asked the students to be polite in their speech."

1. **Explanation for Option 1:**
   - **Imperative Sentence Transformation:** The original sentence is an imperative sentence, which is a command or request. In reported speech, imperative sentences are typically transformed using the structure "asked/told + object + to-infinitive." Here, "Be polite in your speech" is a command, so it is correctly transformed to "to be polite in their speech."
   - **Pronoun Change:** In reported speech, pronouns often change to match the perspective of the reporting. "Your" changes to "their" to reflect the third-person perspective.
   - **Verb Form:** The verb "said" is appropriately changed to "asked" to convey the sense of a request or instruction.

2. **Explanation for why other options are incorrect:**

- **Option 2: "that be polite in their speech."**
     - This option incorrectly uses "that" instead of the "to-infinitive" form. In reported speech, imperative sentences should use "to" followed by the base form of the verb, not "that."

- **Option 3: "to be polite in your speech."**
     - This option fails to change the pronoun "your" to "their." In reported speech, pronouns must be adjusted to fit the perspective of the reporting clause. "Your" should become "their" to correctly reflect the indirect speech.

- **Option 4: "that be polite in your speech."**
     - This option contains two errors: it uses "that" instead of the "to-infinitive" form, and it does not change the pronoun "your" to "their." Both of these are necessary adjustments in reported speech for imperative sentences.

In summary, Option 1 is the correct choice because it accurately follows the rules for converting an imperative sentence from direct to reported speech, including the use of the "to-infinitive" form and the appropriate pronoun change.