Change the following sentence into Indirect Speech : I said to my bro…

The correct answer is Option (1) → I advised my brother not to tell a lie.

Negative imperative in indirect speech:

Change	Direct	Indirect	Why
Reporting verb	said to	advised	“Said to” changes to a verb that suits the sense. Telling someone not to lie is advice, so “said to” becomes “advised”.
Verb form	Don't tell	not to tell	“Don't + verb” becomes “not + to-infinitive”: “Don't tell” becomes “not to tell”.
Full sentence	I said to my brother, “Don't tell a lie.”	I advised my brother not to tell a lie.

The rest of the words stay as spoken: a lie.

Example: The doctor said to him, “Don't eat junk food.” → The doctor advised him not to eat junk food.

Why the Other Options are Incorrect?

Option 2: I asked my brother to not lie. — Incorrect.

• The negative is placed inside the infinitive ("to not lie"). The standard form is not to + verb.
• The spoken words "tell a lie" are changed.

Option 3: I inspired my brother to tell the truth. — Incorrect. It changes the words and the sense: "inspired" and "tell the truth" are not what was said.

Option 4: I informed my brother to never tell a lie. — Incorrect.

• "Inform" means to give information. It is not followed by a to-infinitive.
• "Never" adds a meaning that is not in the original.