"Hotter" can be an adjective (comparative form of "hot") or a verb (present participle of "heat").
The participle form of the verb "hot" ending in "ing" is "hotting." In English, the present participle is formed by adding "-ing" to the base form of the verb. So, in this case, "hot" becomes "hotting" when used as a present participle.
Being is the present participle. The past participle is been.
The past participle of "do" is "done." The past participle of "have" is "had."
The past participle of "begin" is "begun" and the present participle is "beginning."
The present participle of beat is beating, and the past participle is beaten.
The present participle of "sow" is "sowing," and the past participle is "sown."
The present participle of wind is winding, and the past participle is wound.
The past participle of "am not" is "have not been."
No, the word store is not a participle. The present participle is storing. The past participle is stored.
The present participle is swelling. The past participle is swelled.
The past participle is proceeded. The present participle is proceeding.