Hi there!
Cerinta: Replace the Past Tense after until by Past Perfect Simple in order to emphasize the completion of the second action.
1.We didn't get frightened until we heard that noise.
We didn't get frightened until we had heard that noise.
2.The tourists didn't leave the hotel until the rain stopped.
The tourists didn't leave the hotel until the rain had stopped.
3.Mother didn't shut the windows until she swept the floor.
Mother didn't shut the windows until she had swept the floor.
4.The audience didn't applaud until the singer stopped singing.
The audience didn't applaud until the singer had stopped singing.
5.You could not translate the new lesson until you learnt all the new words.
You could not translate the new lesson until you had learnt all the new words.
6.The children didn't start eating until they washed their hands.
The children didn't start eating until they had washed their hands.
7.We didn't stop worrying until William rang us up.
We didn't stop worrying until William had rung us up.
8.Mr.Brown didn't begin his speech until everybody was scated.
Mr.Brown didn't begin his speech until everybody had been scated.
9.Grandfather didn't go to bed until he took his medicine.
Grandfather didn't go to bed until he had taken his medicine.
10.We didn't believe her until she showed us the photos.
We didn't believe her until she had shown us the photos.
❁❁❁❁❁
Past Perfect Simple- mod de formare:
Afirmativ: Subiect + had + Verb-ed/ forma a III-a
Interogativ: Had + Subiect + Verb-ed/ forma a III-a
Negativ: Subiect+ hadn`t + Verb-ed/ forma a III-a
