"investigated"
The past participle of "investigate" is "investigated."
The past participle of "do" is "done." The past participle of "have" is "had."
The past participle of am is been. Not does not have a past participle
The past tense of "have" is "had," and the past participle is also "had."
The past participle of the word "have" is "had."
The past participle of "will" is "willed."
The past participle of "do" is "done." The past participle of "have" is "had."
The past participle of am is been. Not does not have a past participle
The past participle of the word "have" is "had."
The past participle of "will" is "willed."
The past participle of "am, are, is" is "been."
The past participle of "to" is "been." The past participle of "be" is also "been."
The past tense and the past participle is "answered".
The past tense of "have" is "had," and the past participle is also "had."
The past and past participle for "buy" is "bought."
"Sold" does not have any past participle; it is the past participle of "sell".
The past participle of "was" is "been" and the past participle of "were" is also "been".
Being is the present participle. The past participle is been.