Definition :
It express on activity that was completed before another activity or time in the past.
Pattern :
+ S + Hhad + VIII + O
S + Had + Not + VIII + O
? Had + S + VIII + O
Time Signal :
By the time Until yesterday
After Before
When
Examples :
+ They had gone when the class began
- They had not gone when the class began
? Had they gone when the class began?
+ I had been at school when you went to
- I had been at school when you went to
? Had I been at school when you went to
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