Purpose
By the end of this lesson, you will be able to recognize and correctly use the subjunctive in adjective clauses describing something uncertain, and in adverbial clauses of purpose, condition, and time.
Lesson Explanation
Beyond the noun-clause triggers from the previous lesson (wishes, doubt, emotion, impersonal judgment), the subjunctive genuinely also appears in two further clause types with their own distinct logic.
An adjective clause (a relative clause, from Part 2, Lesson 6, that describes a noun) takes the subjunctive when the noun it describes is unknown, nonexistent, or merely hypothetical, rather than a specific, known thing: Busco un empleado que hable inglés. (I’m looking for an employee who speaks English — subjunctive, since no specific employee is confirmed to exist yet) versus Conozco a un empleado que habla inglés. (I know an employee who speaks English — indicative, since this specific person genuinely exists and is known).
Adverbial clauses of purpose always take the subjunctive, since a purpose is inherently a hoped-for outcome, not a fact: para que (so that): Te lo explico para que entiendas. (I’m explaining it to you so that you understand.)
Adverbial clauses of time take the subjunctive specifically when referring to a future, not-yet-realized event, but the indicative when referring to a habitual or past fact: cuando (when): Te llamaré cuando llegue. (I’ll call you when I/he/she arrives — subjunctive, future/hypothetical) versus Te llamo cuando llego. (I call you when I arrive — indicative, habitual fact). This time-clause distinction is genuinely one of the trickiest subjunctive rules, since the conjunction “cuando” itself doesn’t change — only whether the event described is a settled fact or a still-pending future moment.
Practice Questions
1. Beyond noun clauses, what two further clause types does the subjunctive appear in?
View Answer
Adjective clauses and adverbial clauses.
2. When does an adjective clause take the subjunctive?
View Answer
When the noun it describes is unknown, nonexistent, or merely hypothetical.
3. Write “I’m looking for an employee who speaks English,” using the subjunctive.
View Answer
Busco un empleado que hable inglés.
4. Write “I know an employee who speaks English,” using the indicative instead, and why.
View Answer
Conozco a un empleado que habla inglés — indicative, since this specific person is known to exist.
5. Which earlier lesson introduced the relative clauses relevant to this adjective-clause rule?
View Answer
Part 2, Lesson 6.
6. Do adverbial clauses of purpose (like “para que”) always take the subjunctive?
View Answer
Yes, always.
7. Write “I’m explaining it to you so that you understand.”
View Answer
Te lo explico para que entiendas.
8. When does an adverbial clause of time (like “cuando”) take the subjunctive?
View Answer
When referring to a future, not-yet-realized event.
9. When does it take the indicative instead?
View Answer
When referring to a habitual or past fact.
10. Write “I’ll call you when he arrives,” using the subjunctive for a future event.
View Answer
Te llamaré cuando llegue.
11. Write “I call you when I arrive,” using the indicative for a habitual fact.
View Answer
Te llamo cuando llego.
12. Why is this time-clause distinction genuinely tricky?
View Answer
Because the conjunction “cuando” itself doesn’t change — only whether the event is settled fact or still pending.