What is the structure of the past perfect verb tense?

Subject	+	Auxiliary Verb	+	Main Verb	-
=	-	had		Verb + -ed/V3-past participle	-

Grammar rules for the past perfect verb tense:

The past tense of the auxiliary verb "have" is used (had).

The main verb uses the verb form past participle/V3 or -ed is added to main verb.

• Regular verbs add --ed to the verbs base form.
• Irregular verbs see verb chart past participle/V3

Negative statements - "not" is added between the auxiliary verb "have" (had) and the main verb.

Questions - The verb "to be" comes first, then the subject.

Using adverbs is optional. Adverbs come before the main verb in the sentence.

Past Perfect Verb Tense Chart

-	Subject	Auxiliary Verb	-	Main Verb	-
+	I	had	-	stamped	your letter, and then sent it for you.
	We	had	-	read	the books form the library, and returned them last week.
	She	had	-	played	outside for an hour.
-	I	had	not	lived	in New York, before, I moved to Paris.
	You	had	not	studied	very much, that is why you failed your test.
	He	had	not	eaten	all day, so when he got home was hungry.
?	Had	the dog		gone	to the vet. He was very sick for last week.
	Had	you		called	your teacher. She left you a message a few days ago.
	Had	she		cleaned	the house yesterday, because we had a party.

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