Very interesting text on future forms with exercises and rules on how to use each one.

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Future forms
We can use different forms to talk
about future time in English, for example, will and
going to .
1-will + base verb:
To make a prediction based on personal opinion
I think you'll love this film. It's got John Cusack in it.
She's convinced that the team won't win the cup.
Note: In spoken English will is usually shortened to 'll
To express a decision made at the moment of speaking
You go with Michal and I'll iron the shirts.
We've run out of sugar. I'll buy some later today.
To express future facts
Beijing will host the next Olympics.
The class will finish at 7:30 tonight.
In formal written style to express future events

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(often planned in detail)
This clinic will be closed on Bank Holiday Monday.
We are sorry there will be no deliveries of mail during
next week's postal strike.
2-be + going to + base verb:
To make a prediction based on present evidence
Look at those dark clouds, it's going to rain.
The traffic is terrible! We're going to be late.
To talk about plans already made
I'm going to see a film tonight (I've already bought my
ticket).
I've been working hard all week so this weekend I'm not
going to do anything at all!
Vocabulary:
a favour (n):
an act of kindness over and above what is usual. Could you
do me a favour and lend me £10?
to hit the books (informal):
to study
They seem made for each other:
They are a perfect couple. Brad Pitt and Jennifer Aniston

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seemed made for each other. Everyone was really
surprised when they got divorced
a courier (n):
a person or company that delivers packages or documents
very quickly
Complete with Will or Going to