Answer:
Therefore, the correct answer is a) Past, as the pluperfect tense is built on the stem of the past tense.
Step-by-step explanation:
he pluperfect tense is built on the stem of the past tense. In grammar, the pluperfect tense is used to describe an action that had already happened before another past action. It is often formed by combining the auxiliary verb "had" with the past participle of the main verb. For example, in the sentence "She had already finished her homework when her friend called," the verb "finished" is in the pluperfect tense, indicating that the action of finishing the homework occurred before the action of her friend calling. The stem of the pluperfect tense is derived from the past tense of the verb, which is formed by adding "-ed" or "-d" to the base form of regular verbs. Irregular verbs may have different past tense forms, but the stem of the pluperfect tense is still derived from the past tense form of the verb.