A decision at the moment of speaking:
Julie: There's no milk.
John: Really? In
that case, I'll go and get some. A prediction based on opinion:
I think the Conservatives will win the next election A future fact:
The sun will rise at 7am For promises / requests / refusals / offers:
I'll help you tomorrow, if you like. Will you give me a hand?
I will give up smoking!