This month’s topic is one that every English teacher has had to deal with at some point.  English only has two real “tenses” - the past and the present.  The future isn’t formed with a verb; it’s formed with special forms and extra words, so it’s not truly a tense.  However, in most English textbooks, you can find the idea that in English, “will” means “future”.  It’s not true!  This is one of the most common mistakes in conversational English.  Let’s see why.
The idea of the “future” is much more complicated than simply “later than now”.  Rather, it can express lots of different attitudes about the event in the future.  There are four common ways of talking about  future events, and “will” can only be used with three of them.  Let’s take a look.
If Korea is playing Japan in soccer tomorrow, I can talk about possibilities for the result.  I can say “Korea will beat Japan tomorrow probably”.  In this case, I use will because I’m talking about a possibility.  “Will” can mean a possibility. 
If I go to a fortune teller or tarot card reader, they can make a prediction about my life in the future.  They look in their crystal ball and can say “Oh David!  You will have ten children!”  Whoa,  I should start saving my money!  “Will” can also mean a prediction.
Next, imagine I have a lot of luggage and I need to go across town to the bus station.  Unfortunately, I have no money, and no car.  I explain this problem to my friend and he says, “Don’t worry, I’ll take you!”  Here my friend has given me an instant promise.  He will solve my problem.  “Will” can also mean a promise. 
But imagine our last attitude about the future.  Your English teacher asks you about your plans for the weekend.  I cannot say “I will see a movie.”  That’s because will does not mean a plan.  A plan is different from possibility, prediction, or promise because in some way I have already started the process of the action.  Instead, I use a different form of the verb ? the present continuous.  I can say “I’m seeing a movie”. 
So remember, “will” is a very useful word if you are talking about possibilities, predictions, or promises, but don’t use it if you are discussing your plans.