Subjunctive mood - Wikipedia
https://en.wikipedia.org/wiki/Subjunctive_moodThe Proto-Indo-European language, the reconstructed common ancestor of the Indo-European languages, had two closely related moods: the subjunctive and the optative. Many of its daughter languages combined or merged these moods. In Indo-European, the subjunctive was formed by using the full ablaut grade of the root of the verb, and appending the thematic vowel*-e- or *-o- to the root stem, with the full, primary set of person…
Modo subjuntivo: Moods in Spanish. How to use Modo subjuntivo ...
spanish.kwiziq.com › glossary › moodThe Spanish Subjunctive Mood, El modo subjuntivo is mainly used for hypothetical, uncertain statements or desires. The subjunctive can be very confusing for English speakers as it is almost no longer in use in English, but it is still common in Latin-based / Romance languages. The easiest way for English speakers to understand the El modo subjuntivo is to look at the few cases where it's still used in English.