8.5.6 Negación en el past perfect


Ejemplos  
I had already baked the cake, when the door bell rang.
I had not yet baked the cake, when the door bell rang.  
We had gone to London the year before Michael went to college.
We had not gone to London the year before Michael went to college, but the year after.  
She had worked with children, before she became a nanny.
She had not worked with children before she became a nanny.  






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