He said he _______ (not expect) to be attacked by a polar bear.
hadn't expected
Yesterday he was very tired because he _______ (dig) all day.
had been digging
She _______ (study) English for 5 years before she visited Canada.
had been studying
The children _______ (do) their homework and by 10 o'clock they still _______ (not finish) it.
had been doing / had not finished
She _______ (sleep) for 3 hours when we woke her up.
had been sleeping
- I knew you ______ (paint). How did you know? - Your hands were covered with paint!
had been painting.
I _______ just _______ (finish) writing a letter when the door bell rang.
I had just finished writing a letter when the door bell rang.