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文法
Verbs and tense A2 B1

Will for predictions, decisions, offers, and promises

Use will for predictions, quick decisions, offers, promises, and future facts.

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図解ガイド

Will: a future arrow from now

NOW
  (speaking moment)
        │
        │  will + base verb
        │  = point from now to later
        ▼
      FUTURE

Prediction:   I think it will rain later.
Quick choice: I'll answer it.
Offer:        I'll help you with those bags.
Promise:      I won't forget.

Use will when you speak now and point to a future idea: a prediction, quick decision, offer, or promise.

Introduction

What will does

Will is the most flexible way to point from now to the future. Use it for predictions, quick decisions, offers, promises, and future facts. It often shows what the speaker thinks, decides, or agrees to at the moment of speaking. I think it will rain later. I'll answer it. I'll help you with those bags. The short form 'll is very common in speech and friendly writing. The full form will is clearer in formal writing or when you want emphasis.
Core 文法：A2 語彙：A1 Neutral

I think it will rain later.

A common prediction with an opinion opener.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I think
opinion opener
Shows the prediction is the speaker's opinion.
it will rain later
will prediction
Uses will to predict a future result.
ひとまとまりで覚える
Spoken 文法：A2 語彙：A1 Informal

I'll answer it.

The speaker decides at the moment of speaking.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I'll answer it
quick decision
Shows a decision made now.
ひとまとまりで覚える
Core 文法：A2 語彙：A1 Neutral

I'll help you with those bags.

Will can make a friendly offer.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I'll help you
offer
A reusable offer frame with will.
ひとまとまりで覚える
with those bags
help target
Adds what the help is for.
Cognitive metaphor

A future arrow from now

Think of will as a future arrow launched from now. The arrow may carry your opinion about the future, your new decision, your offer, or your promise. In Don't worry, I'll fix it, the decision happens now and points forward. In The sun will rise at 6:12 tomorrow, will states a future fact. This does not mean will is the only future form in English. It is best when the speaker's present judgment or commitment is important.
Spoken 文法：A2 語彙：A1 Informal

Don't worry, I'll fix it.

Will often sounds natural in immediate reassurance.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Don't worry
reassurance
Introduces comfort or reassurance.
I'll fix it
promise or decision
Promises or decides to solve the problem.
ひとまとまりで覚える
Formal 文法：A2 語彙：A2 Formal

The sun will rise at 6:12 tomorrow.

Will is common for neutral future facts and schedules stated as facts.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

The sun
future fact subject
Names the thing with a predictable future action.
will rise
future fact
States a future fact, not a personal plan.
ひとまとまりで覚える
at 6:12 tomorrow
future time
Adds the future time.
Core pattern

Form: will + base verb

The basic form is subject + will + base verb. The verb after will does not change: no -s, no -ed, and no to. Full form: She will start next week. Contraction: She'll start next week. Negative: She won't start next week. Question: Will she start next week? In questions, will moves before the subject. In short answers, repeat will or won't. Use will not when you want a formal or emphatic negative; use won't in normal speech.
Core 文法：A2 語彙：A1 Neutral

She will start next week.

The full form will is clear and neutral.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

She
subject
The person who does the future action.
will start
will plus base verb
The core form: will + base verb.
ひとまとまりで覚える
next week
future time
Adds when the action happens.
Spoken 文法：A2 語彙：A1 Informal

She'll start next week.

The contraction 'll is very common in speech.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

She'll start
contracted will
The common spoken form of she will start.
ひとまとまりで覚える
next week
future time
Adds when the action happens.
Negative 文法：A2 語彙：A1 Neutral

She won't start next week.

Use won't for the negative future form.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

She won't start
negative will
Won't means will not.
ひとまとまりで覚える
next week
future time
Adds when the action will not happen.
Question 文法：A2 語彙：A1 Neutral

Will she start next week?

In questions, will comes before the subject.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Will she start
will question frame
Question form: Will + subject + base verb.
ひとまとまりで覚える
next week
future time
Adds when the possible action may happen.
Sentence xray

Sentence X-ray: useful chunks

Learn will in functional chunks, not only as a rule. In I think it will be fine, the chunk I think introduces an opinion, and it will be fine is the core prediction and reassurance chunk. In I'll send you the file, the core chunk I'll send you can work as a quick decision, an offer, or a promise; the file names what is sent. These chunks are useful because will often connects the speaker's present attitude to a future action or result.
Core 文法：A2 語彙：A1 Neutral

I think it will be fine.

This sentence combines an opinion opener with a will prediction.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I think
opinion opener
Marks the sentence as a personal prediction.
it will be fine
reassuring prediction
A very reusable prediction and reassurance chunk.
ひとまとまりで覚える
Core 文法：A2 語彙：A2 Neutral

I'll send you the file.

Will can show a decision, offer, or promise depending on the situation.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I'll send you
promise or offer frame
A reusable frame for promising or offering to send something.
ひとまとまりで覚える
the file
thing sent
Names what the speaker will send.
Usage rules

Main uses in real life

Use will when you make a choice as you speak: I'll have the soup, please. Use will or won't for promises and refusals: I won't forget. Use will with adverbs like probably, definitely, maybe, and I think when you are predicting. Use will for neutral future facts, especially in notices, explanations, science, and schedules stated as facts. Offers often start with I'll, because the speaker is taking action for someone else. The meaning comes from context, not from a different form.
Spoken 文法：A2 語彙：A1 Neutral

I'll have the soup, please.

I'll have is a practical chunk for choosing now, especially in restaurants.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I'll have
restaurant decision
A common quick-decision phrase when ordering.
ひとまとまりで覚える
the soup
chosen item
Names the choice.
please
politeness marker
Makes the order polite.
Negative 文法：A2 語彙：A1 Neutral

I won't forget.

Won't is useful in promises and refusals.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I won't forget
negative promise
A reusable promise not to do something.
ひとまとまりで覚える
Contrast

Will or be going to?

The closest confusing form is be going to. Use be going to for plans already decided before speaking: I'm going to visit Ana this weekend. Use will when the decision or promise is made now: I'll visit Ana this weekend. Be going to is also natural when present evidence clearly points to the future: Look at those dark clouds. It's going to rain. Will can still make predictions, but it often sounds more like opinion, belief, or calculation than visible evidence.
Contrast 文法：A2 語彙：A1 Neutral

I'm going to visit Ana this weekend.

Be going to is better for an existing plan.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I'm going to visit
existing plan
Be going to shows a plan already decided before now.
ひとまとまりで覚える
Ana
person visited
Names the person.
this weekend
future time
Adds when the plan happens.
Contrast 文法：A2 語彙：A1 Neutral

I'll visit Ana this weekend.

Will changes the feeling: the speaker decides or promises now.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

I'll visit
new decision or promise
Will can show a decision made now or a promise.
ひとまとまりで覚える
Ana
person visited
Names the person.
this weekend
future time
Adds when the action happens.
Contrast 文法：A2 語彙：A2 Neutral

Look at those dark clouds. It's going to rain.

Use be going to, not usually will, when the evidence is visible and immediate.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

Look at those dark clouds
visible evidence
Points to evidence the speaker can see now.
It's going to rain
evidence-based prediction
Be going to is natural when present evidence points to the future.
ひとまとまりで覚える
Danger zone

Danger zone: form and time clauses

Avoid two common mistakes. First, do not put to after will. The mistake is He will to call you. The corrected sentence is He will call you. Second, after time words like when, before, after, and as soon as, use the present simple for the future time clause. The mistake is When I will arrive, I'll call you. The corrected sentence is When I arrive, I'll call you. Will belongs in the main future action, not usually inside the time clause.
Mistake 文法：A2 語彙：A1 Neutral

He will to call you.

After will, do not use to before the main verb.

Corrected 文法：A2 語彙：A1 Neutral

He will call you.

Correct form: will + base verb.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

will call
correct will form
Will is followed by the base verb without to.
ひとまとまりで覚える
you
object
Names the person he will call.
Mistake 文法：B1 語彙：A1 Neutral

When I will arrive, I'll call you.

In future time clauses with when, use the present simple, not will.

Corrected 文法：B1 語彙：A1 Neutral

When I arrive, I'll call you.

Use present simple in the when-clause and will in the main clause.

意味のかたまり

単語ごとではなく、意味のかたまりで文を読んでみましょう。

When I arrive
future time clause
Uses present simple after when to refer to future time.
ひとまとまりで覚える
I'll call you
main future action
Uses will in the main clause for the future action.
Summary

Key takeaways

Will points from the present moment to the future. Build it with subject + will + base verb, use won't for the negative, and put will before the subject in questions. Choose will for predictions, quick decisions, offers, promises, and future facts. Choose be going to instead when you are talking about an existing plan or strong visible evidence. The most useful speaking chunks are I'll..., I think it will..., Will you...?, and I won't....
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