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Both auxiliary verbs are used to speak about the future but:
WILL
followed by infinitive
without 'to' is used to
express:
prediction: He will feel better after the operation.
decisions
made at the time you are speaking: You and your family are in the
sitting room. The phone starts ringing and you say: "I´ll answer it."
volition (What you want to do in the future): I
will take you to the airport.
GOING TO
is used to
express:
the subject's intention to do something in the
future: I am going to buy Jenny a diamond ring for her birthday.
the speaker's certainty about an action in the future because he can see signs in the present of what is going to happen in the
future:
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These trees are going
to lose their leaves very soon.
The leaves are yellow. The colour of the leaves is the sign. |
 With verbs of movement (go, leave, come...), it is more common to use the present
continuous:
Peter is coming with us.
When are you
leaving? Tomorrow morning.
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