Future: will & going to

Intermediate · Verb Tenses

English has several ways to talk about the future, and choosing the right one is about your intention. The two main forms are "will" and "be going to", and they are not always interchangeable.

Use "will" for decisions made at the moment of speaking, predictions, and promises. Use "be going to" for plans you decided earlier and for predictions based on what you can see right now.

How to build it

will + base verb · am/is/are + going to + base verb

Rules & examples

1. "will" for instant decisions made as you speak.

   You decide right now, not before.

   • It's cold — I'll close the window.
   • The phone's ringing. I'll get it.
2. "will" for predictions, promises, and offers.

   Often with "I think", "probably", "I promise".

   • I think it will rain.
   • I'll help you.
   • I promise I won't be late.
3. "be going to" for plans and intentions decided before now.

   You already made the decision earlier.

   • We are going to travel next summer.
   • I'm going to study medicine.
4. "be going to" for predictions based on present evidence.

   You can see the proof right in front of you.

   • Look at those clouds — it's going to rain.
   • Watch out! You're going to fall!
5. Present continuous for fixed arrangements; present simple for timetables.

   Arrangements (with a person/place/time) and official schedules.

   • I'm meeting Sam at 6.
   • The train leaves at 9:00.

Tips to remember

• Decision made NOW = will. Decision made BEFORE = going to. "The bags are heavy." "OK, I'll carry one." (decided now)
• "will not" is contracted to "won't".

Common mistakes

• ✗ I will meet my friend tomorrow at 5. (already arranged) → ✓ I'm meeting my friend tomorrow at 5. — For an arrangement you already made, the present continuous is more natural.