Will

     Will and won't are used to predict a future event which is seen as certain.

I'll be on holiday next week.

I won't do any work at all.   

The film will start in a couple of minutes.

Will and won't are also used to express what we believe or guess to be true about the present.They indicate an assumption based on our knowledge of people and things; their routine, character, and qualities. 

1. Is that the phone? It'll be John. He said he'd ring around now.

2.-I wonder what Meg's doing now?

-It's 7.00. I suppose she'll be getting supper ready.

3.-Don't take the meat out of the oven.It won't be ready yet.

Revision: will and won't are used to predict a future event which is seen as certain/ will and won't are also used to express what we believe or guess to be true about the present; they indicate an assumption based on our knowledge of people and things, their routine, character, and qualities.