past participle

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FORM


[had + past participle]
Examples:

• She had learnt Japanese before she moved to Japan.
  
• Had he seen his uncle when he came back?
  
• By 1970,he hadn't graduated from the niversity.
  
• 
  The past perfect expresses an activity that was completed before another activity or time in the past.
  
• Examples:
  
• She had cleaned the house before her husband came back.
  
• By the time he was 42,he had taught for 20 years.
  
• As soon as he had graduated from university,he got employed in a company.
  
• They were arrested because they had demonstrated in the street.
  
• She wishes she hadn't been divorced.
  
• After her neighbour raped her,she suicided.
  

Form:
Had been +verb+ing.
The past perfect progressive emphasizes the duration of an activity that was in progress before another activity or time in the past.


Examples:

• She had been learning computation theories for seven years before she invented that software..
  
• Had his wife been accompanying him through the cheering crowds?
  
• he had been killing ruthlessly his political oponents for years without qualm.