Subjunctive Future as "everyday language"?
Trying to use textbook perfect English often makes the speaker sound stilted and "outdated" - like you are trying to speak like a character in a novel - sounds good in the book or the movie - but you sound a bit odd in real life.
Is it the same for Subjunctive Future and Subjunctive Future Perfect? Is it used in common parlance?
So many dictionaries/grammar books don't have it.
If you purposely don't use the Subjunctive Future in order to sound "street smart" and "current" - how else do you express this notion? Is there a combination of other conjugations with helping words that express the same idea?
antLerS
2 Answers
Unless you are reading law and/or old stories, etc, you won't need It as it is pretty much obsolete. Picture all of the Old English words that we don't use. (Saith, etc...)
"Venga lo que viniere." I doubt you will say and hear this in a conversation. : )
O Português is another story.
When I remember reading posts written by our native Lazarus from Spain, I am sure that he indicated that future subjunctive is more or less obselete as regards everyday use in Spanish ie conversation, and is only used in Spanish literary works. If I can find the post/s in which he makes such comments or relevant information about the future subjunctive from my native Spanish teacher (who comes from Spain) then I will post them here/add them to this post! )
Lazarus and Heidi (native speakers) both commented on the future subjunctive, Please follow link and read commnents: enter link description here
Paralee, a non native Spanish teacher wrote useful comments in the SpanishDict grammar section under Future subjunctive. Please follow link: enter link description here
The two most commonly used subjunctive forms are:
1 Present subjunctive
The present subjunctive is used instead when you are trying to imply a future meaning!
Ex: Espero que (él) llega mañana = I hope that he arrives tomorrow
It can also be used to express desires:
Quiero que me compres un anillo diamante = I want you to buy me a diamond ring.
(Please do not rush to buy me one as this is only an example lol hehehe! 
) .
and 2 The imperfect subjunctive:
This is used with the conditional indicative to say what you would do if something else were possible
ex: ¡Viajaría por todo el mundo si ganara la lotería! = I would travel around the world if I won the lottery!
I have found some information from my native Spanish teacher on the future subjunctive, which I have copied and pasted from my PDF document:
:FUTURO SIMPLE DE SUBJUNTIVO The future subjunctive is not much used. Currently, it is common that this tense is replaced by another tense in subjunctive. The “future de subjuntivo” is used primarily in the legal field. Specifically, the use can be seen in the articles of the law when voters are voting.Ex: Serán castigados con uno a seis meses de prisión: - los que concurrieren al cuarto oscuro... - los que introdujeren en el sobre... - los que dañaren las boletas... - los que condujeren a otros electores...Some examples:amar amare, amares, amare, amáremos, amareis, amaren comer comiere, comieres, comiere, comiéremos, comiereis, comieren dormir durmiere, durmieres, durmiere, durmiéremos, durmiereis, durmieren ir fuere, fueres, fuere, fuéremos, fuereis, fueren saber supiere, supieres, supiere, supiéremos, supiereis, supieren hacer hiciere, hicieres, hiciere, hiciéremos, hiciereis, hicieren decir dijere, dijeres, dijere, dijéremos, dijereis, dijeren venir viniere, vinieres, viniere, viniéremos, viniereis, vinieren
I hope this helps 
