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)

ラウル・マグイニャ

Langcom 創設者 | ケンブリッジおよびSIELE試験の試験官

9月 6, 2026

B1✏️ 文法⏱️ 読了時間:5分
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Will そして 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 そして 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?

使用方法 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, 、または I believe with will.

When to use might for predictions?

使用方法 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 そして might?

両方とも will そして 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 (例:, I'll go)
  • will not = won't (例:, She won't come)

Common phrases with will そして might

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

  • ~について will:
    I think... I don't think... I'm sure... I believe...
    例: I think she'll pass the exam.
  • ~について might:
    I think... (but with less certainty)
    例: I think it might rain later.
  • For questions:
    Do you think...?
    例: 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> そして <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?

  • 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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スペイン語話者がよく犯す間違い

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

  • Mistake 1: Using will for low certainty.
    誤り: I will go to the party, but I'm not sure.
    正しい: 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.
    誤り: He will goes to the gym tomorrow.
    正しい: He will go to the gym tomorrow.
    (After will または might, always use the base form of the verb, without -s, -ed, 、または -ing.)
  • Mistake 3: Using might not incorrectly.
    誤り: It might not to rain.
    正しい: It might not rain.
    (Do not add to その後 might not.)

よくある質問

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?

はい、, may can also be used to express possibility, similar to might. 例えば、, It may rain means the same as It might rain.

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

No, will そして might are modal verbs, so they do not change form for different subjects. You always use will または 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. 例えば、, I won't be able to come.

関連レッスン

著者について:ラウル・マグイニャ

ラウル・マグイニャ氏は、認定Cambridge English試験対策センターである「Asociación Educativa Langcom」の所長であり、 あなたの国. 。語学教育および国際資格認定の分野で10年以上の経験を持ち、25カ国にわたる数千人の学生、教師、教育機関が、ケンブリッジ英語検定、IELTS、TOEFL、およびMichiganの英語資格を取得できるよう支援してきました。.

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