Will / Be Going To

USE 1 "Will" to Express a Voluntary Action

USE 2 "Will" to Express a Promise

USE 3 "Be going to" to Express a Plan

USE 4 "Will" or "Be Going to" to Express a Prediction
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1
[ when the speaker offers to help someone else ]
[ when we request that someone help us or volunteer to do sth. for us ]
[ when we refuse to voluntarily do something - "will not" or "won't" ]

2
[ when promissing sth. ]

3
[ when a person intends to do something in the future ]
[ it does not matter if the plan is realistic or not:  I’m gonna be an actor when I grow up. ]


4
[ predictions are guesses about what might happen in the future ]
[ the subject has little control over the future , totally different of USES 1-3] 

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 exercises:
http://www.englishpage.com/verbpage/verbs18.htm