Simple Future has two different forms in English: "will" and "be going to." Although the two forms can sometimes be used interchangeably, they often express two very different meanings. These different meanings might seem too abstract at first, but with time and practice, the differences will become clear. Both "will" and "be going to" refer to a specific time in the future.

1. Positive
( + ) S + shall/ will + V1
Example :
- I shall clean my bedroom
- We will go to camping
Or
( + ) S + be + going to + V1
Example :
- I am going to play badminton
- He is going to write a news

Notes : "shall" just can use for subject "I and we"

2. Negative
( - ) S + shall/ will + not+ V1
Example :
- I shan't buy a shoes
- she won't clean the class
Or
( - ) S + be + not +going to + V1
Ex : she is not going to give a present

Notes : shall not = shan't, will not = won't

3. Interrogative
( ? ) Shall/ will + S + V ?
Ex : Will we playing tennis?
Or
( ? ) Be + S + going to + V ?
Ex : are we going to camping ?

FORM Will

[will + verb]

Examples:

You will help him later.
Will you help him later?
You will not help him later.

FORM Be Going To

[am/is/are + going to + verb]

Examples:

You are going to meet Jane tonight.
Are you going to meet Jane tonight?
You are not going to meet Jane tonight.

USE 1 "Will" to Express a Voluntary Action

"Will" often suggests that a speaker will do something voluntarily. A voluntary action is one the speaker offers to do for someone else. Often, we use "will" to respond to someone else's complaint or request for help. We also use "will" when we request that someone help us or volunteer to do something for us. Similarly, we use "will not" or "won't" when we refuse to voluntarily do something.

Examples:

I will send you the information when I get it.
I will translate the email, so Mr. Smith can read it.
Will you help me move this heavy table?
Will you make dinner?
I will not do your homework for you.
I won't do all the housework myself!
A: I'm really hungry.
B: I'll make some sandwiches.
A: I'm so tired. I'm about to fall asleep.
B: I'll get you some coffee.
A: The phone is ringing.
B: I'll get it.

USE 2 "Will" to Express a Promise

"Will" is usually used in promises.

Examples:

I will call you when I arrive.
If I am elected President of the United States, I will make sure everyone has access to inexpensive health insurance.
I promise I will not tell him about the surprise party.
Don't worry, I'll be careful.
I won't tell anyone your secret.

USE 3 "Be going to" to Express a Plan

"Be going to" expresses that something is a plan. It expresses the idea that a person intends to do something in the future. It does not matter whether the plan is realistic or not.

Examples:

He is going to spend his vacation in Hawaii.
She is not going to spend her vacation in Hawaii.
A: When are we going to meet each other tonight?
B: We are going to meet at 6 PM.
I'm going to be an actor when I grow up.
Michelle is going to begin medical school next year.
They are going to drive all the way to Alaska.
Who are you going to invite to the party?
A: Who is going to make John's birthday cake?
B: Sue is going to make John's birthday cake.

USE 4 "Will" or "Be Going to" to Express a Prediction

Both "will" and "be going to" can express the idea of a general prediction about the future. Predictions are guesses about what might happen in the future. In "prediction" sentences, the subject usually has little control over the future and therefore USES 1-3 do not apply. In the following examples, there is no difference in meaning.

Examples:

The year 2222 will be a very interesting year.
The year 2222 is going to be a very interesting year.

John Smith will be the next President.
John Smith is going to be the next President.

The movie "Zenith" will win several Academy Awards.
The movie "Zenith" is going to win several Academy Awards.

IMPORTANT

In the Simple Future, it is not always clear which USE the speaker has in mind. Often, there is more than one way to interpret a sentence's meaning.

No Future in Time Clauses

Like all future forms, the Simple Future cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc. Instead of Simple Future, Simple Present is used.

Examples:

When you will arrive tonight, we will go out for dinner. Not Correct
When you arrive tonight, we will go out for dinner. Correct

ADVERB PLACEMENT

The examples below show the placement for grammar adverbs such as: always, only, never, ever, still, just, etc.

Examples:

You will never help him.
Will you ever help him?

You are never going to meet Jane.
Are you ever going to meet Jane?

ACTIVE / PASSIVE

Examples:

John will finish the work by 5:00 PM. Active
The work will be finished by 5:00 PM. Passive

Sally is going to make a beautiful dinner tonight. Active
A beautiful dinner is going to be made by Sally tonight. Passive

Simple Future Forms

Using "Will"

Positive	Negative	Question
I will help. You will help. We will help. They will help. He will help. She will help. It will help.	I will not help. You will not help. We will not help. They will not help. He will not help. She will not help. It will not help.	Will I help? Will you help? Will we help? Will they help? Will he help? Will she help? Will it help?

Using "Be Going to"

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THE FUTURE TENSE

1   The Simple Form
1.1   Our Intentions
1.2   The Moment Of Decision
1.3   Predictions
1.4   The Normal Passage Of Time
1.5   Scheduled Events
1.6   Future Time Signals
2   The Progressive Form
2.1   Events At Precise Moments In The Future
2.2   Future Events That Are Under Our Control3   A Summary

The future tense has two basic constructions: will and (be) going to.
And each construction has two forms: the simple form and the progressive form.

1 THE SIMPLE FORM
will:

I will work.
You will work.
We will work.
They will work.

He will work.
She will work.
It will work.

I will not work.
You will not work.
We will not work.
They will not work.

He will not work.
She will not work.
It will not work.

Will I work?
Will you work?
Will we work?
Will they work?

Will he work?
Will she work?
Will it work?

Yes, I will.
Yes, you will.
Yes, we will.
Yes, they will.

Yes, he will.
Yes, she will.
Yes, it will.

No, I won't.
No, you won't.
No, we won't.
No, they won't.

No, he won't.
No, she won't.
No, it won't.

[be] going to:

I'm going to work.
You're going to work.
We're going to work.
They're going to work.

He's going to work.
She's going to work.
It's going to work.
I am not going to work.
You are not going to work.
We are not going to work.
They are not going to work.

He is not going to work.
She is not going to work.
It is not going to work.

Am I going to work?
Are you going to work?
Are we going to work?
Are they going to work?

Is he going to work?
Is she going to work?
Is it going to work?

Yes, I am.
Yes, you are.
Yes, we are.
Yes, they are.

Yes, he is.
Yes, she is.
Yes, it is.

No, I'm not.
No, you aren't.
No, we aren't.
No, they aren't.

No, he isn't.
No, she isn't.
No, it isn't.

When we talk about events in the future, we are either talking about

          (1) what we plan to do,
or      (2) what we think will happen,
or      (3) events that cannot be stopped,
or      (4) events that are scheduled to happen
or      (5) events that simply happen with time.

Let’s look at each of these possibilities.

1.1 WHAT WE PLAN TO DO — OUR INTENTIONS An intention is something we plan to do.
We made a decision in the past to do something, and now it is our intention to do it.
If nothing happens to cause us to change our mind, we will do what we have decided to do.
It is under our control, more or less.

I intend to wash my car on Saturday.
We intend to buy a new computer.
I intend to learn golf.

Rather than always using the word "intend", we usually say:

I AM GOING to wash my car on Saturday.
We ARE GOING to buy a new computer.
I AM GOING to learn golf.

If you listen closely to native speakers, you will discover that we almost always use this construction for expressing our intentions.
If you ask a native speaker what he or she plans to do on the weekend, he or she will almost always begin with: "I am going to …" and not "I will …"
There is no particular reason for this. It is simply the way we speak.

Notice in the diagram that the decision has already been made in the past.
There has been time for the plan (the intention) to become concrete in the person’s mind.
This concrete nature of the plan is communicated through the (be) going to construction.

1.2 WHAT WE PLAN TO DO — THE MOMENT OF DECISION Before our intentions are formed, of course, we must first decide to do something.
If we announce our idea at the moment of decision, we usually use the word will:

(A) My car is really dirty.   [A decision is made.]   I know! I WILL wash my car on Saturday!
(B) Our computer is too old. [A decision is made.]   I know! We WILL buy a new computer!
(C) Golf looks like a lot of fun. [A decision is made.]   I know! I WILL learn golf!

The rule of thumb is that the "(be) going to" construction sounds stronger than the "will" construction --- when talking about YOUR PLANS.

1.3 PREDICTIONS

Often when we talk about a future event, we are making a prediction, what we believe will happen based on the information we have or our intuition.
For predictions, we use EITHER will or (be) going to.
There is no difference in meaning.

The economy will turn around in the next quarter.
The economy is going to turn around in the next quarter.
The Euro will solve many problems.
The Euro is going to solve many problems.
After Castro dies, Cuba will become democratic.
After Castro dies, Cuba is going to become democratic.
The next world war will be fought over water.
The next world war is going to be fought over water.
America will win the next World Cup.
America is going to win the next World Cup.

Notice that none of these examples have "I" as a subject.
That is because predictions are about what OTHER PEOPLE (and things) will do.
When you talk about what YOU will do, you are talking about your PLANS, so remember to use the (be) going to construction. [See 1.1 What we plan to do --- our intentions.]

1.4 THE NORMAL PASSAGE OF TIME
Some things will take place no matter what your intentions are, no matter what other people or things do.
They are unavoidable.
We are talking about events that are a result of the normal passage of time.
In the American language, both constructions are used.

He will be fifty on his next birthday.
He is going to be fifty on his next birthday.
We will have an eclipse on the first of the month.
We are going to have an eclipse on the first of the month.
She will retire next week.
She is going to retire next week.

1.5 SCHEDULED EVENTS When talking about events that are scheduled, it is possible to use

will
(be) going to
the simple present
the progressive present
     Something will happen tomorrow.
     Something is going to happen tomorrow.
     Something happens tomorrow.
     Something is happening tomorrow.

You really have a lot of choices here!
First, there are PERSONAL SCHEDULES.

I am seeing my dentist tomorrow.
I am going to see my dentist tomorrow.
I see my dentist tomorrow.
I will see my dentist tomorrow.

For personal schedules, the progressive present and (be) going to are the most commonly used forms.

Then, there are OFFICIAL SCHEDULES.

The next train leaves in one hour.
The next train is leaving in one hour.
The next train will leave in one hour.
The next train is going to leave in one hour.

For official schedules, the simple present and the progressive present are the most commonly used forms.

NOTE:   In England, people tend to use the the simple present for official schedules and the progressive present for personal schedules.

1.6 TIME SIGNALS for the FUTURE TENSE
Time signals for the future tense use words like "tomorrow" and "next".
Here are some examples of future time signals.

at 6:45 a.m.
tomorrow
next Friday
on Thursday
tomorrow morning
tomorrow evening
at noon tomorrow
next Tuesday afternoon
next month
on October 31^st
on Christmas Day
in 2011
in 5 days
5 days from now

Some future time signals are clauses*, with a subject and a verb.
In this case, the verb in the time signal is NOT in the future tense but in the PAST tense!
Here are some examples:

When John CALLS, I will speak to him about your idea.
When I GO on vacation, I am going to read a lot of fiction.
Before we HAVE our meeting, we will eat lunch together.
Before you RETURN next week, we will fix your computer.
After the conference ENDS, there is going to be a lot to do.
After she GETS married, we are going to buy her a car.

Of course the verb in the main part of the sentence (in green) is in the future tense.
But the verb in the Time Clause is always in the simple present tense.
* For an explanation of Time Clauses, go here.

2 THE PROGRESSIVE FORM
will be … ing:

I will be working.
You will be working.
We will be working.
They will be working.

He will be working.
She will be working.
It will be working.

I will not be working.
You will not be working.
We will not be working.
They will not be working.

He will not be working.
She will not be working.
It will not be working.

Will I be working?
Will you be working?
Will we be working?
Will they be working?

Will he be working?
Will she be working?
Will it be working?

Yes, I will.
Yes, you will.
Yes, we will.
Yes, they will.

Yes, he will.
Yes, she will.
Yes, it will.

No, I won't.
No, you won't.
No, we won't.
No, they won't.

No, he won't.
No, she won't.
No, it won't.

2.1 EVENTS AT PRECISE MOMENTS IN THE FUTURE
We sometimes speak as if we absolutely know what will happen in the future.
If we think we know what will happen at a PRECISE MOMENT in the future, we may use the PROGRESSIVE form of the future tense.

When you arrive, I WILL BE WAITING in the VIP lounge.
At this time next week, I WILL BE SITTING on the beach.
At midnight, I WILL BE SLEEPING.

2.2 FUTURE EVENTS THAT ARE UNDER OUR CONTROL
When we use this form, we tend to sound as if we have detailed information about what will happen in the future.
Therefore, we often use this form to express confidence that the future is unfolding exactly as planned.
This makes other people feel comfortable; it sounds as if the speaker has an intimate knowledge of the future.

Ladies and gentlemen, we WILL BE LANDING in ten minutes.
They WILL BE DOING a lot more business next year. I'LL BE ADDRESSING that issue at the appropriate time.
John WILL BE CALLING you tomorrow with the revised figures.

3 A SUMMARY:

(1) If you are talking about an intention --- yours or anybody else's --- use the (be) going to construction.

(2) Otherwise, when talking about the future (predictions, coming events), use both will and (be) going to to give your speech variety.

(3) If you want to communicate confidence about future events --- the idea that everything is normal and under control --- use the will be …ing construction.

(4) For scheduled events (personal or official), you can use the present tense (simple or progressive) as an alternative.