Future simple  will/be going to

will

The future tense is used to describe, promises, voluntary actions, predictions and  spontaneous decisions

the structure is: will + verb infinitive

We can change the will to an 'll


I hope that tomorrow will snow.
I'll send you an email.

The negative form of the will is the won't
the structure is: won't + verb infinitive

I won't study

Question structure will+ subj+inf?

Will you come

Time expressions
I thing
I hope
I guess
I'm sure
Probably
maybe
perhaps
(to the twice tenses)
Tomorrow
on Monday
The day after
the next day
the following day

be going to

The future tense is used to plans,intentions,decisions.
After to use the form be going to the next verb goes in present simple tense

Structures
+subj +to be + going to+inf
-subj +to be+ not + going to+inf
?to be+ subject+going to+inf?

I'm going to come to school tomorrow
I'm not going to come to school tomorrow
Am I going to come to school tomorrow?


Time expressions
I've decided
I've planned