SUBJUNCTIVE IN ADVERB CLAUSES
1) An adverb clause functions within the sentence as an adverb.
The following sentences exemplify how a simple adverb and an adverb clause function in
the same way: they both modify the verb group pode partir by stating "when."
2) Indicative and subjunctive adverb clauses are introduced by a subordinating conjunction,
which links the subordinate adverb clause with the main clause (see the following pages).
3) Either the indicative or the subjunctive may be used in many (but not all) adverb clauses;
the choice of the correct mood depends on the nature of the verb in the main clause.
4) An indicative adverb clause expresses
a) an action, state of being, or condition that is habitually or routinely fulfilled;
b) an action or state of being that is considered real, certain, or factual
(and therefore implies or states "indeed").
5) A subjunctive adverb clause expresses an action or state of being that has not been
completed but is merely a plan, speculation, hypothesis, or condition.
6) Since many adverb clauses may take either a subjunctive or an indicative verb,
the contrastive sentences in the following pages might help an English speaker to choose
the correct mood.
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A personal infinitive often replaces an adverb clause; these alternative constructions are indicated
in parentheses.