1.I had benn reading the book for 2 hours when my mother came. 2. My mother had been cooking the cake since 2 o'clock when I came home. 3. I had been cleaning the room for 2 hours when my mother came. 4. My father had been working for 3 hours when I came. 5. My friend had been going to the cinema since 4 o'clock when I came.
PAST PERFECT:
1. Julia said thar they had seen that film.
2. She didn't know why he had done it.
3. When I saw the bike I understood why he had bought it.
4. Dan didn't want to watch the film, beccause he had seen it before.
5. I remembered that I had locked the door.
PAST PERFECT CONTINUOUS:
1. We had been playing tennis for an hour when it started to rain.
2. I had been waiting for for half an hour before the bus came.
3. It had been raining, so the ground was wet.
4. She was very tired because she had been working very hard.
5. John gave up smoking last month. He had been smoking for 10 years
2. My mother had been cooking the cake since 2 o'clock when I came home.
3. I had been cleaning the room for 2 hours when my mother came.
4. My father had been working for 3 hours when I came.
5. My friend had been going to the cinema since 4 o'clock when I came.