Select the correct indirect speech form of the given sentence.
The teacher said, “You must work hard for your exams.”

Correct option is B

The correct indirect speech form of the given sentence is (b) The teacher advised her students to work hard for their exams.
Rules of Conversion:
Direct Speech:
· The sentence contains the modal verb “must”, which expresses necessity or advice.
Indirect Speech:
· When reporting with “said” and the intention is to advise, we use reporting verbs like “advised” or “told”.
· The modal “must” (strong necessity) often changes to “to + verb” when expressing advice in indirect speech.
✔ Correct structure:
Subject + advised + object + to + base verb + rest
Example:
Direct: She said, “You must eat vegetables.”
Indirect: She advised me to eat vegetables.
�� Booster Rule:
· “Must” for necessity/advice → “to + verb”
· “Must” for compulsion or rule → can stay as “must” in indirect if no other replacement is smooth.