Posted by Anonymous on .
When do you use the past participle: had had, had have, had has?
Any participle can be used by itself (as an adjective) or with an auxiliary verb as the main verb in a clause (with a subject).
What you have written above looks as if you are trying to refer to the use of the auxiliary verb "had" with other forms of the verb "to have" -- which doesn't always work. You can use "have" with "to have" and other verb forms to make the present perfect tense (have walked, have written, has gone skiing, etc.), and you can use "had" with "to have" and other verb forms to make the past perfect tense (had seen, had led, had rung, etc.).
Please post again if there are specific questions you have.