The past participle of "plan" is "planned."
The past form (and also the past participle) of plan is planned.
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 "do" is "done."
The past tense of "have" is "had," and the past participle is also "had."
Planned is the past participle of plan.
The past participle is planned.
Planned is the past participle. (It is also the simple past tense form)
The past form (and also the past participle) of plan is planned.
The past participle of "am not" is "have not been."
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.
Eating is the present participle; eaten is the past participle.
The past participle is thought.
"Did" is the past and "done" is the past participle.