.1- Class had already begun by the time I got there, so I had quiety taken quietly took a seat at the back.
2- She had burst into tears the moment he shouted the door. ????
3- His fingers had begun had begun to bleed as soon as he cut himself. ok
4-He lost his new knife shortly after he had bought it. ok
5-I had never seen any of Picasso's paintings before I visited the art museum. ok
6-He began to read as soon as he had found the place.
7- It already had already rained for half an hour when he stouped stepped out into the street.
8- The patient had already died already already died by the time the doctor arrived. .
9-When emad [???} entered the room ,the thief had already escaped. tenses ok
10- When we got home, night falled. fell OR had fallen
11-The students didn't understand until he had explained the lesson. ok
12- We could not hear ourselves until the aeroplane had taken off. tenses ok
13-The plants didn't grow until the gardener had watered them. tenses ok
14-His neighbours would not speak to him until he had apologized. tenses ok
15-They weren't able to make the pudding until the maid had brought the eggs. ok