Future Tense Questions Medium
No, the future perfect in the past tense cannot be used to talk about unreal past situations. The future perfect in the past tense, also known as the past future perfect, is used to describe an action that was expected to be completed in the future from a specific point in the past. It is formed by using "would have" or "should have" followed by the past participle of the main verb.
On the other hand, to talk about unreal past situations, we use the past perfect subjunctive or the conditional perfect. These verb forms are used to express hypothetical or unreal events or conditions in the past. They are formed by using "had" followed by the past participle of the main verb in the past perfect subjunctive, or "would have" or "should have" followed by the past participle of the main verb in the conditional perfect.
Therefore, if we want to discuss unreal past situations, we should use the past perfect subjunctive or the conditional perfect, not the future perfect in the past tense.