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.