Future Simple is one of the twelve core English tenses. Formed with "will," it's used for predictions, spontaneous decisions, promises, and offers — distinct from "going to," which is for pre-made plans.
When to use future simple
Predictions about the future
An opinion or belief about what will happen, without firm evidence.
Spontaneous decisions (made at the moment of speaking)
A decision made right now, not planned in advance.
Promises and offers
Committing to do something for someone, or offering help.
Facts or certainties about the future
Things that are simply expected to happen, not really "predicted" so much as scheduled to occur.
Structure & formula
| Form | Structure | Example |
|---|---|---|
| Affirmative | Subject + will + base verb | I will call you tomorrow. |
| Negative | Subject + will not (won't) + base verb | I won't be late. |
| Yes/No question | Will + subject + base verb? | Will you call me? |
| WH question | WH word + will + subject + base verb? | When will you call me? |
Signal words & time expressions
These words often (though not always) signal that future simple is the right choice:
tomorrow, next week/month/year, soon, in the future, I think..., probably
Common mistakes
| Incorrect | Correct | Why |
|---|---|---|
| I will going to the party. | I will go to the party. / I'm going to the party. | Don't mix "will" and "going to" in the same phrase — choose one structure. |
| If it will rain, we'll stay home. | If it rains, we'll stay home. | The "if" clause of a first conditional uses present simple, not "will," even though it refers to the future. |
| She wills call you later. | She will call you later. | "Will" doesn't change form for any subject — never add "-s." |
Quick practice
Complete each sentence with the correct form.
- I think it _____ (be) sunny tomorrow.
- The doorbell's ringing — I _____ (answer) it.
- _____ you _____ (help) me with this?
- Don't worry, I _____ (not / forget) your birthday.
- If she calls, I _____ (tell) her the news.
Quick summary
FAQs
What's the difference between "will" and "going to"?
"Will" is typically for decisions made at the moment of speaking, predictions, and promises. "Going to" is for plans or intentions already decided before now: "I'm going to visit my parents next week" (already planned) vs. "I'll visit them, actually — good idea" (decided just now).
Can "will" be used for scheduled events?
For fixed schedules (transport, timetables), present simple is more natural: "The train leaves at 6," not "The train will leave at 6" — though the latter isn't wrong, just less common for fixed schedules.
Will is one of the modal verbs — the same family as can, may, must and should. In reported speech, will becomes would: see direct and indirect speech.