1.Felix phoned the fire brigade when the cooked caught on fire.

2.  The race began when the starter fired his pistol.

3.He was sitting in the garden when a wasp stung him on the nose..

4.While Henry was walking in the mountains, he saw a bear

5. Vicky was having a beautiful dream when the alarm clock rang

6. When Alex saw the question, he knew the answer immediately.

7.The train was waiting when we arrived at the station.

8.Sarah had an electric shock when she touched the wire.

9.When the campers woke up, they saw that the sun was shining.       

1. Felix/ phone/ the fire brigade/ when the cooker/ catch/ fire

`->` Felix phoned the fire brigade when the cooked caught on fire.

2. when the starter/ fire/ his pistol/ the race/ begin

`->` The race began when the starter fired his pistol.

3. he/ sit/ in the garden/ when/ a wasp/ sting/ him/ on the nose

`->` He was sitting in the garden when a wasp stung him on the nose.

4. while/ he/ run/ for a bus/ he/ collide/ with a lamp post

`->`He collided with a lamp post while he was running for a bus.

5. Vicky/ have/ a beautiful dream/ when/ the alarm clock/ ring

`->` Vicky was having a beautiful dream when the alarm clock rang.

`6. `when/ Alex/ see/ the question/ he/ know/ the answer/ immediately 

`->`When Alex saw the question, he knew the answer immediately.

7. the train/ wait/ when/ we/ arrive/ at the station 

`->`The train was waiting when we arrived at the station. 

8. Sarah/ have/ an electric shock/ when/ she/ touch/ the wire 

`->`Sarah had an electric shock when she touched the wire.

9. when/ the campers/ wake/ they/ see/ the sun/ shine

`->`When the campers woke up, they saw that the sun was shining.