Until this topic, every verb form you learned was in the indicative mood: the mood Spanish normally uses to state or report information. The subjunctive is not another tense. It’s a second mood, and it marks one thing: the clause itself is not being asserted as information. Instead, it’s being wanted, doubted, reacted to, recommended, or left pending.
Is this clause being asserted as information, or being framed through wanting, doubting, feeling, recommending, or possibility?
- Asserted as information: indicative.
- Framed through one of those triggers: subjunctive.
This isn’t about whether something is actually true. It’s about how the clause is being presented.
This guide is about making that choice. How to form the subjunctive is a different job, and the Crash Course’s Present Subjunctive lesson covers it fully.
1. Where the subjunctive lives
The subjunctive often appears in a second clause introduced by que. With verbs like wanting, recommending, or doubting, first ask: is the same person doing both actions, or does the action pass to someone else?
- Same person: Spanish usually uses an infinitive.
- Different person: Spanish uses que + a new conjugated verb.
English hides this difference in sentences like “I want you to come”: it puts you straight before an infinitive. Spanish doesn’t. When the person doing the second action changes, Spanish uses que and gives that second person their own conjugated verb.
Then comes the next question: should that verb be indicative or subjunctive? That depends on the trigger — and that’s where WEIRDO comes in.
2. The WEIRDO triggers
So what kinds of expressions trigger the subjunctive? The classic checklist is WEIRDO: Wishes, Emotions, Impersonal expressions, Recommendations, Doubt and denial, and Ojalá:
Notice what all six have in common: the main expression frames the que-clause through a wish, emotion, judgment, recommendation, or doubt instead of simply reporting it. Your scan strategy is simple: look at what comes before que. If it belongs to a WEIRDO family, the que-clause takes the subjunctive.
3. The certainty flip
Here’s the part that trips people up after they learn WEIRDO: belief and certainty verbs take the indicative. Creo que, sé que, es cierto que all assert their clause as real, so no subjunctive appears. Negate them and the assertion disappears, so the mood flips:
But when that belief or certainty is negated, you’re no longer asserting the clause as true — and the subjunctive appears instead.
“I think” can sound tentative in English, so learners often write Creo que venga. But creo que presents the idea as your belief about reality, so it normally takes the indicative: Creo que viene.
Withdraw that belief and the mood changes: No creo que venga. The same pattern appears with pienso que and certainty expressions like es cierto que.
4. Time Clauses: The Cuando Family
Time clauses follow a different rule. With cuando, hasta que, en cuanto, tan pronto como, and después de que, the mood depends on how the event is being viewed. If it happens habitually or has already happened, use the indicative. If it’s a specific event still ahead, use the subjunctive.
As you can see, cuando can go either way. For time connectors, what matters is the time frame: habitual or already happened → indicative; still ahead → subjunctive.
Antes de que (“before”) and para que (“so that”) always take the subjunctive. With antes de que, the second event hasn’t happened yet at the moment of the main action. With para que, the second action is a purpose or goal rather than an asserted fact:
- Salimos antes de que llueva.
- Te lo explico para que lo entiendas.
That’s the core choice: WEIRDO triggers, certainty, and time frame tell you which mood to use. The WEIRDO Triggers and The Cuando Family decks drill those patterns, while the Crash Course’s Present Subjunctive lessons help you master the forms themselves.
Want the full conjugations and more examples? See the Present Subjunctive crash-course lesson.