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 repaired.
The past participle is "designed".
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 am is been. Not does not have a past participle
The past participle of do is done. The past participle of have is had.
The past participle of have is had....:) I have 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.
It can be. It is the past tense and past participle of the verb "to rust." Examples: Rusted steel is not as strong as the original steel. The Tin Man's joints were rusted, so he could not move.
"Did" is the past and "done" is the past participle.
The past participle is had.
What is the past participle of do