Will for the Future

We use will to say what we know or think about the future.
Will here has a neutral meaning. It doesn't express the idea that we have already decided to do something or that we are planning something.

B  will for instant decisions

We use also will for an instant decision, when we decided on something or agree to do it more or less at the moment of speaking.
For example : I'm thristy I'll make some tea.
NOT i make some tea.

The form of will

The form is will or ll.
The west will have rain tomorrow.
Will you be at home this evening.


D Shall 

We can use shall for the Future, but only in the person, after I or we. 
I will be /shall be holiday in August. 
I will and shall have same meaning here, but shall is little formal. 
Both i will and shall can be shortened to i ll which is pronounced /ail/. 
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