4. Complete the sentences using the Past Perfect Continuous 1. We ………….(talk) for an hour when somebody knocked on the door.
2. I ………….(read) this book since 2 o'clock when he came.
3. How long ………….(you live)here before you bought a house?
4. Her eyes are red. She …………..(cry) all evening.
5. She ………….( not work) until he came.