Indicative or Subjunctive?

1. What are these expressions used for?

These expressions help you say how sure or how unsure you are about something.

• Seguramente, probablemente, posiblemente
• Quizás, tal vez
• Es posible que, es probable que

The key question is always:

Do I feel more “sure” (certainty) or more “unsure / evaluative” (doubt, personal view)?

2. The core rule in one view

And two fixed rules:

• Es posible que / Es probable que → always subjunctive.
• The expression itself does not decide the mood. Your attitude (more sure vs. more doubtful) does.

3. Seguramente / Probablemente / Posiblemente

These three are very similar in use.

• + indicative → you see it as quite likely, almost a fact.
• + subjunctive → you keep more distance, it is more hypothetical.

In real conversations, many speakers often use the indicative after these, because we normally talk about what we think is likely. The subjunctive is still correct, but feels more cautious or speculative.

4. Quizás / Tal vez: both possible, what changes?

Quizás and tal vez can go with indicative or subjunctive.

• With indicative → the speaker feels the situation is quite real / concrete.
• With subjunctive → the speaker keeps more distance or sees it as more hypothetical.

Again, in everyday speech, you will hear a lot of indicative. The subjunctive appears especially when you want to sound more careful, polite or clearly show that it is just a hypothesis.

5. Es posible que / Es probable que: fixed subjunctive

Here the rule is simpler.

• Es posible que + subjuntivo
• Es probable que + subjuntivo

Think of the structure as fixed:

• Es posible / Es probable + que + subjunctive.

6. Helpful comparison with English

English does not change the verb form after these expressions, but the meaning is similar.

Use this to feel the difference, but remember: only Spanish uses indicative vs. subjunctive here.

7. Typical doubts and how to solve them

• “Is there a meaning difference or is it just style?”
  • There is usually a small but real difference: more certainty (indicative) vs. more doubt / hypothesis (subjunctive).
  • However, in many everyday contexts, both are possible and acceptable. Native speakers often decide by feeling, not by rule.
• “Should I always use the subjunctive after these expressions?”
  • No. After seguramente / probablemente / posiblemente / quizás / tal vez you choose.
  • Only es posible que / es probable que always require the subjunctive.
• “What do native speakers use more?”
  • With seguramente, probablemente, posiblemente, you will hear the indicative very often.
  • With quizás / tal vez, both moods are common; context and personal style decide.

8. Step-by-step: how to decide quickly

1. Identify the expression
   seguramente, probablemente, posiblemente, quizás, tal vez, es posible que, es probable que…
2. Ask yourself: “Do I feel this is quite true or really uncertain?”
   • If it feels close to a fact → choose indicative.
   • If it feels more like a hypothesis / polite speculation → choose subjunctive.
3. Remember the fixed pair
   If you have es posible que / es probable que → always subjunctive.
4. Form the verb correctly in the chosen mood.

9. Mini self-check

Cover the answers first, then check.

1. 1) You think your colleague is almost certainly stressed. What sounds better in Spanish for you?

   • Seguramente está estresado.
   • Seguramente esté estresado.

   Tip: “Almost certainly” → you probably prefer indicative.

2. 2) You want to sound careful and not assume too much. Which option matches that attitude better?

   • Tal vez tienen un problema con el nuevo programa.
   • Tal vez tengan un problema con el nuevo programa.

   Tip: More careful, more hypothetical → subjunctive.

3. 3) Correct the verb:

   Es probable que el jefe está enfadado.

   Correct: Es probable que el jefe esté enfadado.

If you can explain to yourself why each answer uses indicative or subjunctive, you have understood the core of this topic.