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Grammar Summary

Spanish-3 Unidad 3 Etapa 3

Summary of the Subjunctive

You use the subjunctive in Spanish in subordinate clauses when the main clause expresses:

wishes querer, recomendar, insistir en, aconsejar, etc.
emotion alegrarse, sentir, esperar, ojalá, es bueno/malo/mejor, etc.
doubt, disagreement and denial no creer/pensar, dudar, no es cierto, no es verdad que, etc.

The tense you use in the main clause will help you determine which subjunctive tense to use in the subordinate clause (present, present perfect or imperfect):

Main Clause Indicative Subordinate Clause Subjunctive
If present, future, or present perfect--> present
If present--> present perfect (if the action has already taken place)
If preterite, imperfect, conditional, past perfect--> Imperfect

You have also learned to use the subjunctive after nonexistent or indefinite antecedents and with conjunctions of time:

Nonexistent or Indefinite Antecedents with Conjunctions of Time if the main clause has a command or refers to the Future with Conjunctions of Time, in all situations
No hay nada, nadie que cuando antes (de) que
No tengo...que... en cuanto con tal (de) que
Busco/Necesito/Quiero algo/alguien que... después (de) que a menos que
¿Hay algo/alguien que...? tan pronto como para que
  hasta que en caso (de) que
  You don't use the subjunctive if the conjunction is in a past tense context (it was raining when I left school) because there is no doubt that you left.  

Subjunctive vs. Indicative

Use the Subjunctive: Use the Indicative:
after expressions of doubt

No creo que sepan la respuesta

I don't believe they know the answer

to express certainty

Creo que saben la respuesta

I believe they know the answer

to make suggestions or recommendations

Marta dijo que viéramos los fuegos artificiales

Marta said we should see the fireworks

to report actions

Marta dijo que vimos los fuegos artificiales

Marta said we saw the fireworks