The past participle is owned. This is also the case for the simple past tense.
past tense is owned... I owned that letter. present = i own that letter. past participle... i dont know
The past participle is the past tense form of a verb. Therefore, you have answered your own question already.
No, "had gone" is not a verb on its own. "Had" is the past participle of the verb "to have" and "gone" is the past participle of the verb "to go." Together, they form the past perfect tense of the verb phrase "had gone."
The past participle of "am not" is "have not been."
The past participle of "do" is "done." The past participle of "have" is "had."
If by "lay" is meant the present indicative and infinitive form of "to lay", a transitive verb, the past participle is "laid". "Lay", however, is also the past indicative form of the irregular and intransitive verb "to lie", and if that is the meaning of "lay", it, like other past tense verbs, has no participle of its own; the past participle of this meaning of "lie" is lain.
The past tense of "have" is "had," and the past participle is also "had."
The past and past participle for "buy" is "bought."
Being is the present participle. The past participle is been.
The past participle is thought.
Eating is the present participle; eaten is the past participle.
"Did" is the past and "done" is the past participle.