yellow.
packed
pack - packed; collect - collected
Actually, Pack can either be a Verb or a Noun. When you pack a box with stuff ... it's a Verb, BUT When you carry a Pack on you back ... it's a Noun.
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 tense of "have" is "had," and the past participle is also "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.
"Did" is the past and "done" is the past participle.