Subjunctive Triggers: Complete Reference

This is the master reference. Every time you wonder whether a given construction takes the subjunctive in European Portuguese — and if so, which subjunctive tense — you can return to this page and look it up. The triggers are organized by semantic category, because that is how learners internalize them: you memorize "verbs of emotion trigger subjunctive", not an alphabetical list. Within each category, every trigger is presented with an example, the tense it typically requires, and a note on any irregularities (fluctuating triggers that sometimes take the indicative, subtle register distinctions, and so on).

The page is designed for reference, not linear reading. Bookmark it. Come back to it.

How to use this page

Three questions to ask about any potential subjunctive context:

1. Is there a trigger? — a verb, conjunction, or expression that forces the subordinate clause into a particular mood.
2. Which semantic category does it belong to? — volition, emotion, doubt, impersonal, conjunction, adverb, relative, temporal, conditional, or free-relative.
3. Does the trigger take subjunctive always, never, or depending on context? — most categories are fixed (always subjunctive), but a few trigger-types fluctuate (especially adverbs of probability and some impersonal expressions in the affirmative).

Once you know the category, the tense choice follows from the time reference and the sentence frame (present, past, future, counterfactual).

Category 1: Verbs of volition

Verbs expressing wishes, desires, demands, requests, suggestions, and prohibitions — always take the subjunctive in the subordinate clause when the two subjects differ.

Key principle: same subject → use the infinitive (quero ir, not quero que eu vá). Different subject → subjunctive.

Category 2: Verbs of emotion

Verbs and phrases expressing emotional reactions to someone's action or a situation — always take the subjunctive.

Category 3: Verbs of doubt and denial

Verbs expressing doubt, uncertainty, or denial — take the subjunctive. Their affirmative equivalents (verbs of certainty) take the indicative; when you negate them, they flip to subjunctive.

The affirmative/negative flip is one of the most elegant features of the Portuguese subjunctive. If you assert a belief (acho que ele vem), you use the indicative. If you deny the same belief (não acho que ele venha), the subjunctive takes over.

Category 4: Impersonal expressions

Expressions of the form é + adjective / noun + que — evaluating a situation rather than asserting it. Almost all take the subjunctive, but some (the ones expressing certainty in the affirmative) switch to indicative.

Impersonal expressions that always take the subjunctive

Impersonal expressions that take the indicative (affirmative) / subjunctive (negative)

These assert a fact in the affirmative and deny one in the negative.

Category 5: Subordinating conjunctions

Conjunctions that always trigger the subjunctive, regardless of time frame.

Purpose

Concession

Condition / exception

Time / sequence

These take subjunctive, but which subjunctive tense depends on the time frame (see Category 8 for the future-subjunctive temporal triggers).

Category 6: Adverbs of probability

A small but important category. Some probability adverbs trigger the subjunctive; others take the indicative. The most important distinction for EP learners:

Category 7: Relative clauses with indefinite antecedents

When a relative clause (introduced by que, onde, quem) refers to an unspecified or hypothetical referent — an entity that may or may not exist — Portuguese uses the subjunctive.

Category 8: Future-subjunctive-specific triggers

This is where the tense choice diverges. In Portuguese, certain triggers take the future subjunctive (not the present subjunctive) when referring to a future event. These are almost exclusively time-conjunctions, the open conditional se, and free relatives.

Temporal conjunctions (future reference)

Exception: até que takes the present subjunctive even in future reference (see Category 5).

Open conditional with se

Indefinite free relatives (future reference)

See the future subjunctive overview and the comparison with Spanish for the full treatment.

Category 9: Wish expressions

A handful of frozen expressions of wish or desire that always take the subjunctive.

Category 10: Verbs that switch between indicative and subjunctive

A few verbs switch mood based on meaning — they are both factive (taking indicative) and non-factive (taking subjunctive) depending on context.

Verbs of saying / thinking — affirmative vs. negative

Already covered under doubt (Category 3). Acho que, penso que, creio que, acredito que, suponho que take indicative in the affirmative and subjunctive when negated.

Parece que — a special case

Parece que ("it seems that") is tricky. It takes the indicative in straightforward assertion but can take the subjunctive under certain pragmatic conditions.

Talvez vs. é possível que

Both mean "maybe / it's possible", both take the subjunctive. The difference is structural: talvez is an adverb, é possível que is an impersonal expression.

Quick-reference: the master table

This is the single table to bookmark.

The fluctuating triggers: where the mood is not automatic

A few triggers are genuinely ambiguous — meaning the mood choice depends on speaker intent or register. Worth flagging.

Talvez in post-verb position

When talvez comes before the verb, it triggers the subjunctive. When it comes after the verb — a rarer word order — it takes the indicative.

De forma que, de modo que, de maneira que — purpose vs. result

When these conjunctions introduce a purpose (intended outcome), they take the subjunctive. When they introduce a result (actual outcome), they take the indicative.

Embora + indicative — occasional, colloquial

Prescriptive grammar requires embora + subjunctive always. But in colloquial EP, embora + indicative sometimes appears when the concession is treated as factual. This is technically non-standard but recognizable.

Do not produce the second pattern; but when you hear it, do not assume you've misunderstood.

Common mistakes

Key takeaways

• Portuguese subjunctive triggers fall into ten semantic categories: volition, emotion, doubt/denial, impersonal expressions, subordinating conjunctions (purpose, concession, condition, time), adverbs of probability, relative clauses with indefinite antecedents, future-subjunctive-specific triggers, wish expressions, and mood-switching verbs.
• Most triggers always take the subjunctive. A few take the indicative in the affirmative and the subjunctive when negated (verbs of belief, some impersonal expressions of certainty).
• Adverbs of probability split: talvez, possivelmente, pode ser que → subjunctive. Se calhar, provavelmente → indicative in European Portuguese. This is the most counterintuitive pattern for Spanish speakers and English speakers alike.
• Temporal conjunctions split by tense: antes que, sem que, até que take the present subjunctive. Quando, assim que, logo que, enquanto, sempre que, mal, conforme (future reference) take the future subjunctive.
• Relative clauses take the subjunctive only when the antecedent is indefinite or hypothetical. A specific, known antecedent takes the indicative.
• The open conditional se takes the future subjunctive (se tiveres); the hypothetical se takes the imperfect subjunctive (se tivesses); the counterfactual-past se takes the pluperfect subjunctive (se tivesses tido).
• Same subject = infinitive; different subject = subjunctive. Quero ir (I want to go) vs. Quero que vás (I want you to go).

Cross-references

• Subjunctive Mood Overview — the mood explained semantically, with the five big trigger categories.
• Subjunctive vs Indicative: Key Contrasts — the mood-choice synthesis for present-tense contexts.
• Future Subjunctive vs Present Subjunctive — when the subjunctive is required, which one?
• If-Clauses with the Imperfect Subjunctive — the three-way conditional system.
• Pluperfect Subjunctive: Overview — the compound subjunctive for past irrealis.
• Future Subjunctive: Portuguese vs Spanish — the key divergence from Spanish.