Any verb using "have" or "has" as its auxiliary verb is in the present perfect tense.
Any verb using "had" as its auxiliary verb is in the past perfect tense.
The same can be said for the verb "to have" --
She has had two sandwiches for lunch each day this week.
They have had this television service for two years.
If he had had a sandwich for lunch, he wouldn't be hungry now.
http://www.englishpage.com/verbpage/presentperfect.html = present perfect
http://www.englishpage.com/verbpage/pastperfect.html = past perfect
Check out the other tenses in the list at the left.
help with puncuation - James while John had had had had had had had had had had ...
English - When do you use the past participle: had had, had have, had has?
english - 28. Even today, young people .Ö study Leninís theories at the ...
English - 1. He had a slight headache. 2. He had a light headache. 3. He had a ...
English - 1. I had poor eye sight, so I had to go to an eye hospital. I had my ...
Math - 14. Parks A survey of 300 parks showed the following. 15 had only camping...
English - 1. If I had studied hard, I could have gotten a higher score. 2. If I ...
College Mathematics - A survey of 300 parks showed the following 15 had only ...
English - 1. If I had brought an umbrella, I would not have gotten wet. 2. If I ...
English - We had a health checkup at school. We had to go to hospital. My ...