Final answer:
The two components of the pluperfect tense are 'had' and the past participle form of the main verb. It is used to describe an action that had already been completed before another past action.
Step-by-step explanation:
The two components of the pluperfect tense are had and the past participle form of the main verb. The pluperfect tense is used to describe an action that had already been completed before another past action.
For example, in the sentence, "I had finished my homework before the party started," the word "had" is the auxiliary verb and "finished" is the past participle form of the main verb "finish."