
Originally Posted by
dricha17
The way I teach it (specifically to Spanish speakers) is that the adverb clause uses the subjunctive in the present tense to talk about a future event being dependent on something else happening.
Yes, that's correct, but only if you are teaching Spanish grammar, not English grammar:
Use of the Subjunctive in Spanish
Adverbial clauses give information such as “when”, “why”, “how” or “where” something happens. The verb in an adverbial clauses will be in the subjunctive if the action/state in the clause is anticipated —that is, viewed as being in the future in comparison to the action/state represented by the governing verb.
Ex: Cuando termines la tarea iremos
al cine.
Translation: <When you finish the homework, we'll go to the movies.> [Subj.: anticipated action]
Note, the Spanish verb
termines is in the subjunctive; the English verb
finish is not; Cf.
When she finishes, we will go to the movies.
Source
http://www.123teachme.com/learn_spanish/use_of_the_subjunctive_1
Learn more
here