1. не (to sit) in a cafe, when i (to see) him. 2. my friend (to talk) to the teacher, when i (to see) him. 3.when the phone (to ring), they (to have) dinner. 4.the boy (to fall) and (to hurt) himself while he (to ride) his bicycle. 5. she (to wait) for her sister, when i (to see) her. 6. when the pupils (to hear) the bell, they (to get up) and (to leave). 7. when i (to go) out, the sun (to shine). 8. while she (to play) the piano, i (to write) a letter. 9. he (to go) to the university, when i (to meet) her. 10. our friends (to discuss) something when we (to interrupt) them. 11. my mother (to watch) tv,

1. he was sitting in a cafe, when I saw him.
2. my friend was talking to the teacher, when I saw him.
3. when the phone rang, they were having dinner.
4. the boy fell and hurt himself while he was riding his bicycle.
5. she was waiting for her sister, when I saw her.
6. when the pupils heard the bell, they were getting up and leaving.
7. when I got out, the sun was shining.
8. while she was playing the piano, I was writing the letter.
9. he was getting to the University, when I met her.
10. our friends were discussing something when we interrupted them.
11. My mother is watching TV