Simple Future Tense

How do we use the Simple Future Tense?

No Plan
We use the simple future tense when there is no plan or decision to do something before we speak. We make the decision spontaneously 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 is made at the time of speaking.
We often use the simple future tense with the verb to think before it:

* I think I'll go to the gym tomorrow.
* I think I will have a holiday next year.
* I don't think I'll buy that car.

Prediction
We often use the simple future tense 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
When the main verb is be, we can use the simple future tense even if we have a firm plan or decision before speaking. Examples:

* I'll be in London tomorrow.
* I'm going shopping. I won't be very long.