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).
http://grammar.ccc.commnet.edu/grammar/verbs.htm#participle
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.).
http://grammar.ccc.commnet.edu/grammar/auxiliary.htm
Please post again if there are specific questions you have.
The past participle is a verb form that typically ends in -ed (for regular verbs) or has an irregular form (for irregular verbs). It is used in various tenses and grammatical constructions, including the perfect tenses and passive voice.
In the examples you provided, "had had," "had have," and "had has," these are not common or grammatically correct phrases. It seems that you may be combining the past participle "had" with other verb forms.
Here are a few correct examples of using the past participle:
1. In the past perfect tense: "He had eaten dinner before the movie started."
- In this sentence, "had eaten" is the past perfect tense, combining the helping verb "had" with the past participle "eaten."
2. In the present perfect tense: "She has finished her homework."
- In this sentence, "has finished" is the present perfect tense, combining the helping verb "has" with the past participle "finished."
3. In the passive voice: "The cake was baked by my mother."
- In this sentence, "was baked" is the passive voice, combining the helping verb "was" with the past participle "baked."
Remember that the exact usage of the past participle depends on the verb tense and grammatical construction being used.
The correct usage of the past participle in the expressions you mentioned would be "had had" and "had had." Let me explain how to use each of them correctly:
1. "Had had" is the past perfect tense of the verb "have." It is used to indicate an action that occurred before another past action. For example:
- Incorrect: "I had have dinner before I went to the movies."
- Correct: "I had had dinner before I went to the movies."
Here's how you can identify and use the past perfect tense:
- Look for a past action (e.g., "went to the movies").
- Identify an action that happened even earlier in the past (e.g., "had dinner").
- Combine them using "had had" in the correct order: "I had had dinner before I went to the movies."
2. On the other hand, "had have" and "had has" are not grammatically correct expressions. The word "had" indicates the past tense, and using "have" or "has" after it creates a redundancy.
To use the past tense correctly, stick to "had" followed by the past participle of a verb (e.g., "had eaten," "had seen," "had done"). For example:
- Incorrect: "She had have finished her homework."
- Correct: "She had finished her homework."
Remember that it is essential to understand the basic rules and structures of verb tenses to use them accurately. Practice and exposure to different examples can also help solidify your understanding.