The Future Perfect Tense in Português is used to talk about actions that will be completed before a specific point in the future. It's like saying, 'By the time something happens, this action will already be done.'
To form the Future Perfect Tense, first use the future tense of 'ter'. For example, 'terei' (I will have), 'terás' (you will have), 'terá' (he/she/it will have), 'teremos' (we will have), 'tereis' (you all will have), 'terão' (they will have). Then, add the past participle of the main verb. For example, 'terminado' (finished), 'viajado' (traveled), 'feito' (done).