1) Look! Somebody (has broken) that window.

2) I (have been reading) the book you gave me but I (have not finished) it yet.

3) "Sorry I am late." That is all right. I (have not been waiting) long.

4) Hello! I (have been cleaning) the windows. So far I (have cleaned ) five of them and there are two more to do.

5) There is a strange smell here. (Have you been cooking) something?

6) My brother is an actor. He (has appeared) in several films.

7) "Sorry, I'm late." "That's alright. I have not been waiting long."

8) "Is it raining?" "No, it has stopped."

9) I have lost my address book. Have you seen it?

10) I have been reading the book you lent me, but I have not finished it yet.

11) I have read the book you lent me, so you can have it back now.

12) This is a very old book.I had it since I was a child.