1. we have learnt english for six yeaars 
-> english has been leant for six years by us
2. in the past, people often made banh chung for Tet themelves 
-> in the past , banh Chung was often made for Tet 
3. it waas happy for us to attend the english club last night 
-> we were happy to attend the English club last night
4. when should i start the computer ?' Nguyen asked his teacher 
-> nguyen asked his teacher When he should start the computer 
5. "where dit you go last sunday, Mary ?" daisy asked 
-> daisy asked mary Where She had gone the Sunday before 
6. shall we surf the net for the location of Ninh Binh province?
-> I suggest we should surf the net for the location of Ninh Binh province
7. In the past, people didn't travel on holiday 
-> in the past, traveling on holiday is very rarely