Steel is a noun and so doesn't have any verb tenses.
The past participle of the verb steal is stolen.
The past tense and past participle is equipped; equipping is the present participle.
Designed is both the simple past and the past participle of 'design'.
The past participle is "designed".
The past participle is repaired.
Invented is the past participle of the verb invent. verb /past /past participle = invent /invented /invented
Steel is a noun. It's a metal: his sword was made of steel. Perhaps you are referring to "steal"-- which means to rob or take something that isn't yours. The simple past tense of "to steal" is stole. He stole $50 from the cash register. The past participle is "stolen"-- After he had stolen the money, he felt guilty about doing it.
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
What is the past participle of do
The past participle of have is had....:) I have had...
The past participle is had.
The past participle is willed.
The past participle is been.
The past participle is thought.
Being is the present participle. The past participle is been.
To isn't a verb and so doesn't have a past participle. The past participle of be is been.
The past tense and the past participle is "answered".