6. She was born on May 10th, 1996.
=>Her birthday is on May 10th,1996.
7. Nga must wash the dishes every day.
=>Nga has to wash the dishes every day
8. We began to study English 4 years ago
=>We have studied English for 4 years.
9. No one in class is as tall as Tam.
=> Tam is the tallest student in the class.
10. Women often did the housework without the help of modern equipment in the past.
=> In the past women used to do the housework without the help of modern equipment.