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The compound future tense (Futuro do Pretérito) in Portuguese is a verb tense used to express an action that will have been completed before another future action or event. It is formed by combining the future tense of the auxiliary verb "ir" (to go) with the infinitive form of the main verb.

Formation: Subject + ir (future tense) + infinitive of the main verb

For example:

• "Eu irei ter estudado antes do exame." (I will have studied before the exam.)
• "Eles irão ter terminado o projeto na próxima semana." (They will have finished the project by next week.)

Usage:

• To indicate an action that will be completed before a specific future time or event.
• To express a future condition or hypothesis.
• To convey a sense of certainty or prediction about a future occurrence.

It is important to note that the compound future tense is not as commonly used in spoken Portuguese as it is in written form, particularly in formal contexts or literature.