1. Mary started cooking for the party three hours ago.

=> Mary has been cooked for the party three hours age.

 2. I last saw him when we graduated.

=> I haven’t  seen him when we graduated.

3. It is three weeks since Tom had his hair cut.

=> Tom hasn’t  had his hair cut for three weeks.

4. She began to collect stamps in 2000.

=> She has begun to collect stamps for 2000.

5. The last time Lucy wore this dress was a week ago.

=> Lucy hasn’t  wore this dress for a week.

6. Tom began to play the piano when he was a child.

 => Tom has begun to play the piano since he was a child.

7. It is five years since Tim and Julie got married.

=> Tom and Julie have gotten married for five years.

8. It is two years since my friend lived in Hanoi.

=> My friend has lived for two years in HN.

9. This is the first time she has tasted Indian food.

=> She hasn't   tasted India food before.

10. It hasn’t rained heavily for a long time.

=> It is the first time it has rained heavily for a long time.

1. Mary has cooked for the party for three hours.

2. I haven’t seen him since we graduated.

3. Tom hasn’t had his hair cut for three weeks.

4. She has collected stamps since 2000.

5. Lucy hasn’t worn this dress for a week.

6. Tom has played the piano since he was a child.

7. Tom and Julie have got married for five years.

8. My friend has lived in Hanoi for two years.

9. She has never tasted Indian food before.

10. It is a long time since it last rained.