Will vs To be going to

“The past is always tense, the future perfect.”

― Zadie Smith

We use WILL:

  • to make decisions that are made at the time of speaking
    Ouch, I cut my finger. I will go fetch a bandaid now.
  • to state a fact about the future
    Jane will be 45 next year, we need to buy a nice present for her.
  • to make a promise
    I will start dieting from next year onwards.
  • to make a prediction
    The next decade will be tense in terms of world politics.
  • with words like I think, I guess, I hope, probably, possibly
    I think, I will fall in love with this festival.

We use BE GOING TO:

  • a future event that has been planned before the time of speaking
    We are going on holiday to Spain next year.
  • to make a future prediction based on facts / evidence
    The sky is so dark! It is going to rain soon.

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