When and while

La diferencia básica entre when y while es que siempre se usa while para hablar de una acción continua, para poner énfasis en la duración.
When se puede usar también para acciones puntuales.
Los ejemplos de frases que utilizo en el video:
When you arrive, call me.
She arrived while I was sleeping. (Sleeping es una acción de larga duración.)
While I was reading the newspaper, the children watched TV. (Aquí se entiende dos acciones continuas y simultáneas)
When I got home, I read the newspaper. (Sin énfasis en la duración.)
Is there anything you want to do when / while you’re here? (Si elegimos while, ponemos énfasis en la duración, pero las dos son posibles.)
While I was eating lunch, the phone rang. (Eating lunch tiene una duración.)
You can clean the living room while I wash the dishes. (Otra vez, dos acciones simultáneas y con cierta duración.)
1. I was having lunch  James arrived. 

2.  I heard the doorbell, I went to the door. 

3.  Jo was washing her hair, I did my homework. 

4.  I buy the bread, you can go to the butcher's. 

5. I was at the baker's  I met Jo. 

6. The customer was being helped by the salesman  the thief came into the store. 

7.  you saw Keith, was he with Jo? 

8. I was in the shop  someone stole my bag. 

9. I hurt my back  I tried to lift the piano. 

10.  we were standing outside the cinema, someone picked my pocket.

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