I know we can use 'will be' to talk about future facts, eg.

l will be 34 tomorrow.

But, can we use 'going to be' instead of 'will be', at least in informal situations?

l'm going to be 34 tomorrow.

  • 1
    Yes, you can. There's nothing wrong your sentence.
    – Varun Nair
    Commented Oct 27, 2017 at 8:55
  • @Nair That means they are totally synonymous?
    – Mido Mido
    Commented Oct 27, 2017 at 10:27
  • The going to be construction is informal, will can be used in both formal and informal situations.
    – semperos
    Commented Oct 27, 2017 at 13:45
  • @semperos Yea. Good explanation.
    – Mido Mido
    Commented Oct 28, 2017 at 9:33

1 Answer 1


Although will and going to are different in some ways, in casual speech and writing, will and going to are often interchanged.

When we want to talk about future facts or things we believe to be true about the future, we use will.

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