Past Perfect Positive : 
a. I had locked my car before i left it
b. He had told me about the test result before we arrived at school
Past Perfect Negative :
a. You hadn't locked the door before you left for work!
b. It hadn't got it's milk all day long
Introgative :
a. Had I told you about those news before ?
b. Had smoked a lot before you met her?

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