Future: will/won't

Will: uses (Source: https://dictionary.cambridge.org/es/)

1)Certainty in the future

One of the main uses of will is to refer to things in the future that we think are certain:

The rooms will be redecorated but all the facilities will be the same.

He’s still there at the moment.

He’ll be there until the new guy starts.

[talking to a child]

Will you be 5 in September?

2) Making predictions

Will is used to make predictions about the future:

Have you decided what you are going to do with the car?

No. Father thinks it’ll cost a lot of money to fix.

I think they’ll be off in January again. (they’ll be away, possibly on holiday)

Some predictions are about facts – things that we know always happen:

It’s all wool. It’ll shrink if you wash it in hot water.

Some predictions are about the present:

That’ll be Katie shouting. (The speaker is certain. He or she makes a deduction because of what they know about the situation.)

3) Conditional sentences

We often use will (or the contracted form ’ll) in the main clause of a conditional sentence when we talk about possible situations in the future:

If she gets the job, she will have to move to Germany.

I’ll take a day off if the weather’s fine next week.

4) Intentions and decisions

We use will for immediate intentions and decisions. We usually use ’ll, not will, after I think:

When I go and see Marie, I think I’ll take her some flowers.

What will you do with that soup? Will you just put it in the fridge or will you freeze it?

I think I’ll have some orange juice, actually.

ATTENTION: We use will and be going to for decisions, intentions and plans. We use will when the decision is immediate and be going to when we have already made a plan:

It’s too expensive to fly on the Friday. Look it’s nearly £200. It’s only £25 to fly on Thursday.

We’ll fly on Thursday then.

Great. That’ll save us lots of money.

We’re going to drive to Birmingham on Friday, and Saturday morning we’re going to drive to Edinburgh.

5) Willingness and offers

Will is often used to express someone’s willingness to do something or to make offers. It is often used with I in this context:

I’ll show you where to go.

It’s just a leaflet that I’ve got.

Just the leaflet. Right, I’ll go and get you a brochure too.

I’ll give you a lift to the hotel.

6) Promises

We use will to make promises:

I’ll be there for you. Don’t worry.

We’ll always love you.

7) Requests and invitations

We often make requests or invitations with will:

Will you pass me the salt?

This tastes good. Will you give me the recipe?

Will you come for dinner on Saturday?

8) Commands

We sometimes give commands or orders using will:

Will you be quiet, please!

Will you stop picking your nails!

It is also used to insist that someone does something:

But you will have to do it. You’ll have no choice.

[parent to child]

You will wear it whether you like it or not.

9) General truths

Will is used to describe something the speaker thinks is generally true:

[talking about making complaints at hospitals]

Do you think they should try and make it easier for people to complain?

No, cos some people will always complain. (cos = because in informal speech)

10) Habitual events

We use will to refer to events that happen often:

[talking about a younger sister, Celia, who doesn’t eat properly; she refers to Celia]

Celia will start to get upset if she has to eat cabbage or meat like chicken breast. My mum will say, ‘Just try it’. And she’ll start shaking her head and going, ‘No. I don’t want to’. Mum will put it near her mouth and she’ll start to cough.

11) Disapproval

Will is also used to talk about repeated behaviour which the speaker does not like or approve of. Will is normally stressed here:

He will leave his clothes all over the floor. It drives me mad. (stronger than He leaves his clothes all over the floor.)

12) Inanimate objects (things)

Will may be used to refer to inanimate objects and how they respond to humans, most typically in the negative form won’t:

The car won’t start.

The door won’t open. It’s stuck.

Will and shall

We use will for all persons, but we often use shall with I and we. Will (’ll) is generally less formal than shall when used with I and we:

Simply complete the form and return it to me, and I shall personally reserve your hotel room for you.

We shall look at a full report from the centre.

We’ll see you in the morning.

Shall also has a special legal use for talking about rules and laws. In these cases, we often use it with third-person subjects:

According to the basic principle of human rights, people shall not be discriminated against because of their nationality, race, age, sex, religion, occupation and social status.

Shall and will are both used to talk about intentions and decisions. Shall is more formal than will.

Mucha info no? Bueno no te preocupes, es para que veas todos sus usos, y como en ocasiones podes usar el "going to" tambien

Y..que pasa con el shall= uso mas formal, para temas relacionados a la ley, los vas a encontrar con I/we, por eso no te sorprendas si lo ves en una lectura.

Let's see the struture

WILL/ ABREVIATURA 'LL (usar abreviatura en oraciones en afirmativo, n o en preguntas ni respuestas cortas)

WILL NOT= ABREVIATURA/FORMA CONTRAIDA= WON'T