The past participle of "refer" is "referred."
The past participle of "do" is "done." The past participle of "have" is "had."
The past participle of "am not" is "have not been."
Referring is the present participle of refer.
The past participle of "do" is "done."
The past tense of "have" is "had," and the past participle is also "had."
No, the word 'referred' is a verb, the past participle, past tense of the verb to refer. The past participle of the verb also functions as an adjective.The noun forms of the verb to refer are referrer, referral, and the gerund, referring.
The past participle of "do" is "done." The past participle of "have" is "had."
The past participle of "am not" is "have not been."
The past participle of the word "have" is "had."
The past participle of "will" is "willed."
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.