Et Write sentences in the past continuous.
At 5 o'clock yesterday afternoon ...
1 My teacher (X read / talk to a friend).
My teacher wasn't reading. She was talking to
a friend
2 The dog (X sleep / run in the garden).
3 1(X write a letter / read an email).
4 The children (X watch TV/✓ do homework).
5 You (X study / play computer games).
6 lt (X rain / snow).​

According to the history teacher of magic, Cuthbert Binns , Hogwarts was founded about a thousand years ago, four wizards : sorcerers Godric Gryffindor , Salazar Slytherin and Ravenclaw and fairies Candida Penelope Hufflepuff . The aim of the founders was the training and education of children with magical potential. These children were collected throughout the country. However, over time among the founders split. Salazar Slytherin believed that the school should not teach children whose parents 

2. I had been waiting for him for 20 minutes when I realised that I was in the wrong restaurant.
3. At the time the factory closed down, Sarah had been working there for five years.
4. The orchestra had been playing for ten minutes when a man in the audience suddenly began shouting. 
5. I had been walking along the road for five minutes when I saw a monster. 

16.3

1. It was very noisy next door. Our neighbours were having a party.
2. We were good friends. We had known each other for a long time.
3. John and I went for a walk. I had difficulty keeping up with him because he was walking so fast.
4. Mary was sitting on the ground. She was out of breath. She had been running.
5. When I arrived, everybody was sitting round the table with their mouths full. They were eating.
6. When I arrived, everybody was sitting round the table and talking. Their mouths were empty but their stomachs were full. They had eaten.
7. Jim was on his hands and knees on the floor. He was looking for his contact lens.
8. When I arrived, Kate was waiting for me. She was rather annoyed with me because I was late and she had been waiting for a very long time.
9. I was sad when I sold my car. I had had it for a very long time.
10. We were extremely tired at the end of the journey. We had been travelling for more than 24 hours.