V. 
1/ gets up
2/ had left
3/ has been learning/ has learnt
4/ meeting
5/ listening
VI.
1/ It was not until Helen returned her hometown, she was happy.
2/ It was not until he was 30, he knew how to swim
3/ If Nam had worked hard, he would not have failed the exam.
4/ If it had not rained last night, I would not have go to the barbecue.
5/ Their houses are being cleaned for Tet.
6/ A new school are being built.
VII.
1/ If Lan had not been ill, she would have gone to school yesterday.
2/ What kind of music do you like?

V.
2/ have left
3/ have been learning/ have learnt

5
1/ gets up
2/ had left
3/ has been learning/ has learnt
4/ meeting
5/ listening
6
1/ It was not until Helen returned her hometown, she was happy.
4/ If it had not rained last night, I would not have go to the barbecue.
5/ Their houses are being cleaned for Tet.
6/ A new school are being built.