Perfect Verb Tenses

The past perfect verb tense is used to describe an action that was completed before another action or point in the past.

I had finished my homework before dinner.

The present perfect verb tense is used to describe an action that has been completed at some point in the past but is relevant to the present.

She has visited Paris three times.

The structure is 'had' + past participle of the verb.

The structure is 'has/have' + past participle of the verb.

The helping verb is 'had'.

'Has' is used with singular subjects in the present perfect tense, while 'had' is used with all subjects in the past perfect tense.

A helping verb, or auxiliary verb, is used with a main verb to form a verb phrase that indicates tense, mood, or voice.

I had never seen the movie before I watched it last night.