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According to Cambridge, going to is used for predictions, intentions and commands. However, in my coursebook Interchange, which is also published by Cambridge, there is this example:

I'm going to be 30 tomorrow.

To me, this sentence doesn't contain either a prediction, intention or command, which makes the use of will a better alternative. Am I correct, or is this sentence really about a prediction, as in, I predict that I will be 30 tomorrow?

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    Cambridge doesn't define what it means by these terms or how they differ from one another, but I'm going to be 30 tomorrow is certainly a prediction. If the earth is hit by an asteroid this afternoon, you might need to revise as I was going to be 30 tomorrow. – choster Sep 17 '18 at 14:58
  • Until and unless we develop time travel and discover that future events are immutable, discussions about the future are always predictions. – Jason Bassford Supports Monica Sep 17 '18 at 18:02
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There is a further use of "be going to": To talk events happening in the future as a consequence of the present state. "It is my birthday, so I'm going to be 30 tomorrow."

The pattern developed from a metaphor. We say "I'm going to London" to mean "there is a road which I will follow and at the end of the road is London". So when we use "going to" we get the idea of the future as being like places on a road.

So when we talk of prediction and intentions we mean "because I am on this 'road' I predict that this event will happen" or "because I choose to take this 'road' this event will happen".

If you say "I'm going to be 30 tomorrow", we are invoking this metaphor. "On the road of life, the place called "being 30" is tomorrow."

This metaphor is rich enough that nearly all future tense expressions can be expressed with "going to", or with "will". We tend to use "going to" with intentions or predictions, but we can use it for almost anything.

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