Making predictions about the future	

I	Strong predictions based on present evidence

Subject   +  is/are going to    +  verb	

These are very strong prediction based on some present evidence

It's going to rain	(Present evidence: I can see black clouds)	
You're going to kill yourself	(Present evidence: your present lifestyle - you take drugs, do  dangerous sports etc.)	
He's going to make a fortune	(Present evidence: your present performance – you have an excellent mind for business etc.)	
You're going to end up in prison	(Present evidence: your present behaviour – you do or plan to do criminal acts)	

Negative s:

Subject  +  isn't /aren't  going to  +  verb	

You're not going to pass	(Present evidence: You aren't doing and haven't done any revision etc.)	
They're not going to come	(Present evidence: They are already two hours late; they are never usually late etc.)	

II	Other strong predictions

(I'm sure) +  subject + will  + verb	
I'm sure you'll find it.  	Short form*:  I'm sure you will   	

Subject + will  + (definitely) + verb	
It'll definitely be here tomorrow  	Short form:  I'm sure it will	

(I'm sure) + subject + won't  + verb	
I'm sure she won't be angry  	Short form:  I'm sure she won't	

Subject  +  (definitely) + won't  + verb	
She definitely won't come  	Short form:  She definitely won't	

*short forms are commonly used as responses.

III	Less certain predictions

I should / would  think + subject + will + verb	

I should think he'll be alright	short form:  I should think he will / I should think so	

Subject +  probably +  will	

She'll probably call	short form: She probably will	

Subject + may / might / could + verb	

She may come 	short form:   She may	

Subject +  probably + won't	

It probably won't be that difficult	short form:   It probably won't	

I doubt (very much) (if) + subject + will + verb	

I doubt she'll tell him
I doubt very much she'll tell him
I doubt that will happen
I doubt if that will happen	short form:    I doubt it
short form:    I doubt she will