Construction: will/shall + infinitive
(1) We use the future simple to express a promise.
- They will allow you to go through.
- He shall be present tomorrow at the meeting.
- I will do my best.
(2) We use the future simple to express a prediction about the future.
- His birthday will bring much happiness to the people.
- Next year will be a great surprise.
- I don’t know what will happen if it doesn’t succeed.
(3) The future simple is used to express a voluntary action, usually, it is used for a spontaneous decision right at the moment as we’re making it.
- Can you help me, please? Yes, I will help you right this instant.
- Could you send me the check, please? Yes, I will send it now.
- He shall prepare your lunch sir.
- He will make the order.
(4) Note that, there are many similarities between will and the ‘be going to’ form. For instance, both can mean ‘an intention’, or ‘a prediction’.
- ‘I am going on vacation in March’. or ‘I will go on vacation in March’.
- ‘I think this man is going to be the next president’. or ‘I think this man will be the next president’.