English — will vs going to
Both will and going to talk about the future, but they are not interchangeable. Use will for decisions made at the moment of speaking, offers, and predictions based on opinion; use going to for intentions decided beforehand and predictions based on present evidence.
How it works
Choose the form by the speaker's mindset, not the timing. Deciding as you speak takes will: "The phone's ringing — I'll get it." A plan you already had takes going to: "We're going to move house next year." For predictions, will signals opinion ("I think it'll be fine"), while going to signals visible evidence ("Look at those clouds — it's going to rain").
Examples
| Meaning | Form | Example |
|---|---|---|
| Spontaneous decision | will | The phone's ringing — I'll get it. |
| Offer / promise | will | Don't worry, I'll help you with the bags. |
| Prediction (opinion) | will | I think United will win the match. |
| Prior intention / plan | going to | We're going to visit Rome this summer. |
| Prediction (evidence) | going to | Look at those clouds — it's going to rain. |
Good to know
Will is not ungrammatical for a previously arranged plan: I will meet my friends tonight can be a neutral future statement. Use going to or the present continuous when you want to foreground the prior intention or arrangement: I'm going to meet / I'm meeting my friends tonight. In speech, will is usually contracted to 'll; after stating a plan with going to, you can switch to will for the details you decide on the spot.