What auxiliary verbs are used to form the future perfect tense?

The future perfect tense is constructed to describe actions that will be completed before a specified point in the future. The correct form of auxiliary verbs to create this tense is "will have." When combined, these auxiliary verbs indicate that an action is expected to be completed in the future, thus providing clarity on the timing and completion of that action.

For instance, in a sentence like "I will have finished my homework by 8 PM," the phrase "will have" explicitly shows that the action of finishing homework is projected to be completed before the time reference of 8 PM. This use of "will have" is crucial for expressing not just future actions, but specifically those that are anticipated to be complete at a certain future time.

The other options involve auxiliary verbs but do not align correctly with the structure of the future perfect tense, reinforcing that "will have" is the precise formulation necessary for this grammatical tense.