The idea from Subjunctive mode appears on the ground of the grammar where a mode It is a category expressed in the verb that indicates values such as syntactic dependence on certain types of subordination or the attitude of the individual regarding the statement.
The subjunctive mode is one that marks what is said in the predicate as uncertain , incomprobable , Not specific or not confirmed . The hypothesis and the desired , therefore, they are placed in this grammatical mode.
Let's see a example . The phrase "He who insults the emperor will be sentenced to prison" It is developed in a subjunctive way because it refers to a hypothetical case. The expression indicates that if someone ever verbally assaults the emperor, he will receive some punishment.
“You would have been a great forward”, meanwhile, is another phrase in subjunctive mode. In this case, a subject tells another that, according to his belief or opinion, he could have stood out in the field of soccer Playing as an attacker. The statement is unlikely: there is no way to know if, indeed, the person in question would have shone in the sport, since he never dedicated himself to the activity in a professional manner.
"It is imperative that we save before moving", “Those who damage the club's facilities will be expelled”, “I wish we could leave earlier”, “If I had known that, I would not have acted in the same way” and "They need to explain what happened" are others expressions in subjunctive mode.
It should be noted that the subjunctive mode is used in many Languages . Its characteristics and particularities depend on each language.