WII AND GOING TO - INTERNATIONAL CERTIFICATE

Will

One of the most common ways to talk about the future is with will, for example:

I will call you tonight.

We often call this the "future simple tense", but technically there are no future tenses in English. In this construction, the word will is a modal auxiliary verb.

Here are the three main ways that we use will to talk about the future.

No plan

We use will when there is no prior plan or decision to do something before we speak. We make the decision at the time of speaking. Look at these examples:

Hold on. I'll get a pen.

We will see what we can do to help you.

Maybe we'll stay in and watch television tonight.

In these examples, we had no firm plan before speaking. The decision was made at the time of speaking.

We often use will with the verb think:

I think I'll go to the gym tomorrow.

I think I'll have a holiday next year.

I don't think I'll buy that car.

Prediction

We often use will to make a prediction about the future. Again, there is no firm plan. We are saying what we think will happen. Here are some examples:

It will rain tomorrow.

People won't go to Jupiter before the 22nd century.

Who do you think will get the job?

Be

The verb be is an exception with will. Even when we have a very firm plan, and we are not speaking spontaneously, we can use will with be. Look at these examples:

I will be in London tomorrow.

There will be 50 people at the party.

The meeting will be at 9.30 am.


To be going to

Intention

We use the special to be going to construction when we have the intention to do something before we speak. We have already made a decision before speaking. Look at these examples:

I have won $1,000. I am going to buy a new TV.

We're not going to see my mother tomorrow.

When are you going to go on holiday?

In these examples, we had an intention or plan before speaking. The decision was made before we spoke.

Prediction

We often use to be going to to make a prediction about the future. Our prediction is based on evidence. We are saying what seems sure to happen. Here are some examples:

The sky is very black. It is going to snow.

It's 8.30! You're going to miss the train!

I crashed the company car. My boss isn't going to be very happy!

In these examples, the present situation (black sky/the time/damaged car) gives us a good idea of what is going to happen.

http://www.englishclub.com/grammar/verbs-m_future-gt.htm