ex. 3
1. was walking
2. were planning
3. was taking
4. were working
5. were you doing
6. wasn't playing
ex. 4
1. were doing, came
2. were reading, was sleeping
3. looked, saw
4. was reading, started
ex. 5
1. The event took place on 12th June.
2. The event was planned by a group of 16 year old students from the local high school.
3. Over 500 people took part in the event.