Use: future simple: will
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Use: to be + going to
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Instant decision (=when we decide
to do something at the time of speaking).
I will have a cup of coffee.

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Intention
(=the speaker has already decided before). I am going to have a cup of coffee.
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I will operate my patient again.

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I am going to operate my patient.
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Prediction
(= what we think will happen).
He will travel to Ireland.

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Prediction based on a present situation
(=what we can see is going to happen).
He is going to travel to Ireland.
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He will hit the ball.

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He is going to kick the ball.

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