Combine the pairs of sentences using the time expressions in the boxes given below and rewrite them using the past perfect tenses. (i) Rohan packed his suitcase. He left for the airport. (ii) We started work. He arrived in the morning. (iii) They set up the tents. The others brought food and medicine. (iv) The students became quiet. They heard the teacher coming. (v) The villagers left the village. The flood submerged the entire area.
(i) Rohan had packed his suitcase before he left for the airport. (ii) We had started work before he arrived in the morning. / We had started work by the time he arrived in the morning. (iii) They had set up the tents before the others brought food and medicine. / After they had set up the tents, the others brought food and medicine. (iv) The students had become quiet before they heard the teacher coming. / The students had become quiet when they heard the teacher coming. (v) The villagers had left the village before the flood submerged the entire area. / The villagers had left the village by the time the flood submerged the entire area.
Explanation
The past perfect tense is used to show that one action was completed before another past action. Time expressions like 'before,' 'after,' 'by the time,' and 'when' help establish the sequence. The earlier action uses past perfect (had + past participle), while the later action uses simple past.