Explanations:
उपरोक्त Active sentence में (is + advising) के प्रयोग से स्पष्ट है कि वाक्य Present continuous tense में है अत: इसका Passive structure निम्न प्रकार होगा- A.V. – Subject + is/am/are + V₁ +ing + Object P.V. – Object + is/am/are + being + V³ + by + Subject Correct Passive Sentence - The students are being advised by the invigilator not to carry calculators into the examination hall.