When Leondardo da Vinci built his helicopter he worked on his design many years.He drew bird in flight to learn about aeridynamics.
We flew for twenty minutes when the pilot announced we had to go back beacuse of bad weather.
The teacher asked for my project on inventions for weeks when I finally gave it to her last Monday.
I found out why my pen friend did not get my letters.I sent them to the wrong adress!
Our favourtie band played for only ten minutes when there is a power cut and the concert had to be cancelled.We were upset beacuse we died to see them for years.
