Cevap:
I have lost my key. Can you help me look for it?
I have been reading the book you gave me but I haven't finished it yet.
"Sorry, I'm late!" - "That's all right. I haven't been waiting long.
I have been cleaning the windows. So far I have cleaned five of them. There are only two more to do.
There's a strange smell in here. Have you been cooking something?