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'Going to' expresses a prior plan or evidence-based prediction; 'will' expresses a spontaneous decision or general prediction.
Side-by-side comparison
"Going to" expresses plans already decided or predictions based on visible evidence right now. The decision already exists before you speak.
I have already bought the tickets; we are going to see the play on Saturday.
Look at those dark clouds, it is going to rain very soon, I can feel it.
She has decided she is going to study medicine next year.
We are going to spend two weeks in Japan in August, we booked the flights three months ago.
Look at those dark clouds, it is going to rain. We should head inside now.
"Will" expresses decisions made at the moment of speaking, promises, predictions without immediate evidence, or spontaneous offers. The decision arises as you speak.
The phone is ringing. I will get it, do not worry.
I think she will do really well in the interview tomorrow.
Will you help me carry these boxes upstairs? They are quite heavy.
I will call you as soon as I land, do not worry if it is late.
I think the presentation will go well, she has prepared it very thoroughly.
Common mistake
- •"I will going to" is impossible: they are alternatives, never combined.
- •And using "going to" for a spontaneous decision sounds odd: if the phone rings and you decide to answer right now, say "I will answer it", not "I am going to answer it" (which implies you already planned it).
Trick to remember it
Already decided? "Going to". Deciding right now while speaking? "Will". Visible evidence of what will happen? "Going to". Is it a promise or offer? Always "will". Formal written text? "Will" in both cases.
Quick rule
- •"Going to" = prior plan + prediction with visible evidence.
- •"Will" = spontaneous decision + general prediction + promises + offers.
- •Formal written text: prefer "will".
Did you know?
English has at least seven different ways to talk about the future: WILL, GOING TO, present continuous ("I am meeting him tomorrow"), present simple ("The train leaves at nine"), ABOUT TO ("I am about to call"), SHALL (formal British English), and the future perfect. WILL in its origins was not a future marker: it was a full verb meaning "to wish" or "to want." Over time it lost that meaning and became the quintessential future marker of modern English.
Practise what you learned
Exercise 1 · Pick the right one
"Look at those clouds!" "It _____ rain. Let's go inside."
Exercise 2 · Pick the right one
"The phone is ringing!" "Don't worry, I _____ get it."
Exercise 3 · Form the word
Exercise 4 · Pick the right one
Look at those clouds! It _____ rain. We should take an umbrella.
Exercise 5 · Pick the right one
"I can't carry all these bags." "Don't worry, I _____ help you."
Exercise 6 · Form the word
Related word pairs
'Be about to' signals something happening very soon; 'be going to' expresses plans or predictions.
Present simple expresses facts, routines, and permanent truths; present continuous expresses current or temporary actions.
Present simple can express future when an event has a fixed official schedule; otherwise use 'will' or 'going to'.
'A' is used before consonant sounds; 'an' is used before vowel sounds.
Bryan López
Founder of SpeakUP Academy