Will is a modal auxiliary verb. It is followed by an infinitive without to. There is no –s in the third person singular.
- She will come. (NOT She wills come.)
- I will do it.
Questions and negatives are made without do.
- Will you come with me? (NOT Do you will …)
- I will not let him go.
To express simple futurity
Will is used to talk about future events that you are certain about or things that are planned.
- Ann will be 10 years old next month.
- There will be trouble if he catches you stealing his flowers.
- The train leaves at 9:30, so we will be home by lunchtime.
To talk about willingness
Will shows determination or willingness on the part of the speaker.
- I will come with you.
- There is the doorbell. I will go.
- We will not surrender.
Will can also express a promise or a threat.
- I will do whatever I can to help you.
- I will teach him a lesson.
- We will dismiss you from service.
To ask someone to do something
Will can be used to ask someone to do something.
- Ask John if he will help.
- Will you lend me some money?
- Will you give the book to John when you meet him?
To make requests and offers
Will can be used as a polite way of inviting someone to do something or of offering someone something. Note that would is a more polite form of will.
- Will you join us for a drink?
- Will you send me the report?
Won’t you is used to make a pressing offer.
- You will have some coffee, won’t you?
To give orders
Will can be used in orders.
- Will you be quiet?
- If you don’t behave, you will go straight to bed.
To talk about possibility
Will can show possibility.
‘There is the doorbell.’ ‘That will be Sita.’