Will and Might for Predictions: Expressing Future Certainty (B1 Grammar) — B1 English grammar lesson by Langcom

Will and Might for Predictions: Expressing Future Certainty (B1 Grammar)

Raúl Maguiña

Fundador de Langcom | Examinador de Cambridge y del SIELE

septiembre 6, 2026

B1✏️ Gramática⏱️ 5 minutos de lectura
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Will y might are modal verbs we use to talk about the future, specifically to make predictions. They both help us guess what will happen, but they show different levels of certainty. Use will when you are very sure or confident about a future event. For example, I think it will rain tomorrow means you believe it strongly. On the other hand, use might when you are less certain, indicating a possibility. For instance, It might rain tomorrow suggests it’s possible, but you’re not confident. Understanding this difference is key for clear communication about future events in English.

What are ‘will’ and ‘might’ for predictions?

Will y might are special verbs called modal verbs. We use them to talk about what we expect to happen in the future.

They help us express how sure or unsure we are about a prediction.

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When to use will for predictions?

Uso will when you are very sure or confident about a prediction. You believe something is very likely to happen.

  • It shows a strong belief or expectation.
  • We often use phrases like I think, I'm sure, o I believe con will.

When to use might for predictions?

Uso might when you are less sure. It means something is possible, but not certain.

  • It shows a possibility, not a strong expectation.
  • The chance of it happening is lower than with will.
  • Might is similar to may for expressing possibility.

How to form sentences with will y might?

Ambos will y might are modal verbs, so their structure is simple. They are the same for all persons (I, you, he, she, it, we, they).

  • Positive: Subject + will/might + base form of the verb
  • Negative: Subject + will not (won't) / might not + base form of the verb
  • Questions (with will): Will + subject + base form of the verb? (We usually don't make direct questions with might for predictions, but use phrases like Do you think...?)

Remember the short forms:

  • will = 'll (p. ej., I'll go)
  • will not = won't (p. ej., She won't come)

Common phrases with will y might

We often use introductory phrases to make our predictions sound more natural.

  • Para will:
    I think... I don't think... I'm sure... I believe...
    Ejemplo: I think she'll pass the exam.
  • Para might:
    I think... (but with less certainty)
    Ejemplo: I think it might rain later.
  • For questions:
    Do you think...?
    Ejemplo: Do you think they'll win the game?
  • Short answers:
    I think so. / I don't think so.
    We might. / We might not.
Forms of <span data-no-translation>Will</span> y <span data-no-translation>Might</span> for Predictions
<span data-no-translation>Will</span> (Sure Prediction) <span data-no-translation>Might</span> (Possible Prediction)
Positive I will go. / I'll go. I might go.
Negative I will not go. / I won't go. I might not go.
Question Will you go? Do you think you might go?

Ejemplos

  • I think the new movie will be very popular.
  • She won't be late for the meeting, I'm sure.
  • Do you think he'll accept the job offer?
  • They might visit us next weekend, but they haven't decided yet.
  • It might not be warm enough to swim today.
  • I don't think I'll finish this project by Friday.
  • He might get a promotion next year.
  • I'm sure you'll do great on your presentation!

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Errores habituales de los hispanohablantes

Spanish speakers sometimes confuse the level of certainty between will y might.

  • Mistake 1: Using will for low certainty.
    Incorrecto: I will go to the party, but I'm not sure.
    Correcto: I might go to the party, but I'm not sure.
    (Use might when you are not sure.)
  • Mistake 2: Forgetting the base form of the verb.
    Incorrecto: He will goes to the gym tomorrow.
    Correcto: He will go to the gym tomorrow.
    (After will o might, always use the base form of the verb, without -s, -ed, o -ing.)
  • Mistake 3: Using might not incorrectly.
    Incorrecto: It might not to rain.
    Correcto: It might not rain.
    (Do not add to después de might not.)

Preguntas más frecuentes

What is the main difference between 'will' and 'might' for predictions?

The main difference is certainty. Use will when you are very sure about a prediction, and might when you are less sure, indicating a possibility.

Can I use 'may' instead of 'might' for predictions?

Sí, may can also be used to express possibility, similar to might. Por ejemplo, It may rain means the same as It might rain.

Do 'will' and 'might' change for different subjects (I, he, they)?

No, will y might are modal verbs, so they do not change form for different subjects. You always use will o might followed by the base form of the main verb.

How do I make a negative prediction with 'will'?

To make a negative prediction with will, you use will not or its contraction won't. Por ejemplo, I won't be able to come.

Lecciones relacionadas

Sobre el autor: Raúl Maguiña

Raúl Maguiña es el director de la Asociación Educativa Langcom, un centro autorizado de preparación para el examen Cambridge English en tu país. Con más de una década de experiencia en la enseñanza de idiomas y la certificación internacional, ha ayudado a miles de estudiantes, profesores e instituciones educativas de 25 países a conseguir las certificaciones de inglés de Cambridge, IELTS, TOEFL y Michigan.

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