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Choosing between a prior plan and a spontaneous decision.
Why you specifically
The rule
Use be going to for a plan, intention, or prediction based on present evidence. Use will for a decision made at the moment of speaking, an offer, or a prediction not based on evidence. In IELTS, both forms are common, so the key is the speaker’s reason for choosing the future form.
Both correct
Every sentence here is correct English. Only the meaning changes.
I am going to study tonight.
A plan or intention decided before now.
I will study tonight.
A decision made at the moment of speaking.
The trap
I will visit my grandmother tomorrow.
I am going to visit my grandmother tomorrow.
Use be going to for a plan or intention that was decided before now.
Look at those dark clouds. It will rain.
Look at those dark clouds. It is going to rain.
Use be going to for a future result that you can see evidence for now.
I am going to help you with your bags.
I will help you with your bags.
Use will for a decision made at the moment of speaking.
She will study medicine next year.
She is going to study medicine next year.
Use be going to for a future plan or arrangement already made.
Prove it
10 drills
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Rivals
