FUTURE WILL, FOR PREDICTIONS AND NOT PLANNED ACTIONS

Use

1) Future actions happen without the speaker's intention

The sun will shine tomorrow.

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2) Predictions, assumptions

I think Sue will arrive in Paris at 6 pm.

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3) Spontaneous actions

Hang on! I'll have a word with you.

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Signal words

no unambiguous ones

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Form

will + infinitive 

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Examples

Affirmative sentences: 
He will play football.
He'll play football.
Negative sentences:

He will not play football.
He won't play football. or He'll not play football. 
Questions:

Will he play football?