1 Because I have been working in the garden all morning.
2 Because I have lost my car keys.
3 Yes, please. It smells delicious.
4 Yes. I have been working on this project all day and I haven't finished it still.
5 Who have been using my MP3 player?
6 Jason is having a birthday party.
7 What do people wear on Rememberence Day?
8 Have you found a dress for the prom night?