tuviera
Tuviera is the imperfect subjunctive form of the Spanish verb tener. It corresponds to the first and third person singular forms, as in yo tuviera, tú tuvieras, él tuviera. The form is part of the imperfect subjunctive, used in subordinate clauses to express doubt, emotion, possibility, desire, or hypothetical situations in a past-reference frame or in present/future contexts viewed from a past perspective. There is also the variant tuviese, which belongs to the other (se) set of the imperfect subjunctive.
Formation and variation: tuviera is derived from the third person plural of the pretérito perfecto simple (tuvieron)
Usos: se emplea en cláusulas subordinadas que requieren el modo subjuntivo en contextos de duda, deseo, emoción,
Relación con otros tiempos: es distinto de hubiera, que forma parte del pretérito anterior. Tuviera/tuviese es