From the given alternatives, choose the one which best expresses the sentence in Active/Passive voice.
The doctor advised the patient not to eat chocolates

The patient was advised by the doctor not to eat chocolates.

The correct answer is The patient was advised by the doctor not to eat chocolates.

The original sentence is in active voice, with the subject "doctor" and the verb "advised". To change it to passive voice, we make the object of the active sentence, "patient", the subject of the passive sentence. The verb "advised" becomes "was advised", and we add the preposition "by" to show who is doing the action. This gives us the passive voice sentence "The patient was advised by the doctor not to eat chocolates".

The other options are incorrect.

• The patient was advised by the doctor that he should not eat chocolates is also in passive voice, but it changes the meaning of the sentence. The original sentence means that the doctor told the patient not to eat chocolates, but the passive voice sentence means that the doctor told the patient that he should not eat chocolates.
• The patient was being advised by the doctor that he should not chocolates by the doctor is in the continuous passive voice, which is not commonly used in English.
• The patient has been advised not to eat chocolates by the doctor is in the perfect passive voice, which is used to describe actions that have been completed in the past. This sentence is not appropriate for the original sentence, which describes a single action that happened in the past.