1. There is no milk left. Someone has drunk it .
2. Look at all those dirty dishes. You have not cleaned the table after yourself.
3. I don't think I can pass this exam. I have not read any books.
4. Did you hear that noise? Someone has broken a cup.
5. I'm really hungry. I have not eaten anything yet.
6. I can't find my wallet. I have left it in the bus.