It acts as a noun-modifier.
The past participle form of the word "use" is "used."
Used is the past participle; using is the present participle.
The past participle for "am using" is "have used."
"Use" is a regular verb; therefore, its past participle is "used".
The word sitten is the past participle of sit. It is used as a verb.
No. -ing is used for the present participle.
There is no past participle. The idiomatic construction "have to" means "must" and is used as an auxiliary verb. (The verb to have has the past tense had and the past participle had.)
The past participle of fashion (used as a verb) is fashioned.
No. When used as a verb, the past participle of coat is coated.
Used (e.g "It had been used for...", "John was used", etc.)
Worse is rarely used as a verb. When it is, the past and past participle is worsed.
The past tense of "get" is "got," and the past participle is "gotten." In American English, "gotten" is often used as the past participle, while in British English, "got" is commonly used as both the past tense and past participle.