You use will to indicate that you hope, think, or have evidence that something is going to happen or be the case in the future.

You use will in order to make statements about official arrangements in the future.

You use will in order to make promises and threats about what is going to happen or be the case in the future.

You use will to indicate someone's intention to do something.

You use will in questions in order to make polite invitations or offers.

You use will in questions in order to ask or tell someone to do something.

You can use will in statements to give an order to someone.

You use will to say that someone is willing to do something. You use will not or won't to indicate that someone refuses to do something.

You use will to say that a person or thing is able to do something in the future.

You use will to indicate that an action usually happens in the particular way mentioned.

You use will in the main clause of some 'if' and 'unless' sentences to indicate something that you consider to be fairly likely to happen.

You use will to say that someone insists on behaving or doing something in a particular way and you cannot change them. You emphasize will when you use it in this way.

You use will have with a past participle when you are saying that you are fairly certain that something will be true by a particular time in the future.

You use will have with a past participle to indicate that you are fairly sure that something is the case.