Viết lại câu: It often tales me thirty minutes to walk to school

1. It often tales me thirty minutes to walk to school.
-> i often spend....
2. After 4 years aboard, mr.Brown returned home as am excellent engineer.
-> after mr.Brown....
3.Sarah hasn't seen her triêng since she left for the united states.
-> Sarah last....
4. We haven't gone to a concert for ages.
-> It's ages since...