Past Perfect

Positive sentences:

Subject	+	Auxiliary verb	+	Past participle
I/a dog etc.		had		eaten/given/gone

Negative sentences:

Subject	+	Auxiliary verb + not	+	Past participle
I/a dog etc.		hadn't/ had not		eaten/given/gone

I hadn't seen Berlin before I flew there in the summer. He said Mr. Johnson hadn't mowed the lawn

Questions (interrogative sentences):

Auxiliary verb	+	Subject	+	Past participle
had		I/a dog etc.		eaten/given/gone

Had he known some words before he started learning English?

Taken from http://www.englishtenseswithcartoons.com/page/tenses/past_perfect

I recommend to visit the page to see some good examples with cartoons.

USE 1 Completed Action Before Something in the Past

More exemples http://www.englishpage.com/verbpage/pastperfect.html

• I did not have any money because I had lost my wallet.

Situations which happened before a specific moment in the past

By the time he was twelve, Mozart had composed a simphony.

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With the expressions it was the first/second/third,.../ time

It was the first time we had visited Cuba.

With the expression just to talk about recent actions in the past.

He had just bought the car when he had the car accident.

Exercises for extra-practice.

Difference in the use of past perfect and past simple in Spanish by AulaFácil

Practice difference in the use of past perfect and past simple.

http://www.ego4u.com/en/cram-up/grammar/simpas-pasper/exercises
http://www.aulafacil.com/Ingejerc/Lecciones/Ejerc22.htm
http://www.englishpage.com/verbpage/verbs11.htm
http://www.usingenglish.com/quizzes/140.html http://english.baladre.org/sedaviwebfront/pastpastperfect.htm
http://perso.wanadoo.es/autoenglish/gr.pastperf.i.htm