What is the past tense and participle of was?

The verb "was" is the past tense of the verb "be." It doesn't have a separate past participle.

Here's why:

* Past Tense: "Was" is already the past tense form. It describes an action or state that happened in the past.

* Past Participle: The past participle of "be" is "been." We use "been" in conjunction with auxiliary verbs like "have" and "had" to form perfect tenses (e.g., "I have been," "I had been").

So, to summarize:

* Past Tense: Was

* Past Participle: Been