SIMPLE FUTURE

Simple Future has two different forms in English: "will" and "be going to." Although the two forms can sometimes be used interchangeably, they often express two very different meanings. These different meanings might seem too abstract at first, but with time and practice, the differences will become clear. Both "will" and "be going to" refer to a specific time in the future.

Verbal
Pattern “will”
S + will + V1 (+)
S + will + not + V1 (-)
Will + S + V1 (?)

Ex:
I will sleep
I will not (won't) sleep
Will I sleep?

Pattern “ Be(am/is/are) + goimg to”
S + be + going to + V1 (+)
S + be + going to + not + V1 (-)
Be + going to + V1 (?)

Ex:
I am going to go to Roma
I am not going to go to Roma
Am I going to go to Roma?

Nominal

“will”
S + will + be + non verb

“be + going to”
S + be + going to + be + nonverbal

"Will" often suggests that a speaker will do something voluntarily. A voluntary action is one the speaker offers to do for someone else. Often, we use "will" to respond to someone else's complaint or request for help. We also use "will" when we request that someone help us or volunteer to do something for us. Similarly, we use "will not" or "won't" when we refuse to voluntarily do something.

Ex: I will send you the money when I get it.

"Will" is usually used in promises. Ex: Don't worry, I'll be careful.

"Be going to" expresses that something is a plan. It expresses the idea that a person intends to do something in the future. It does not matter whether the plan is realistic or not.

Ex: Azka is going to spend his vacation in New York.

Both "will" and "be going to" can express the idea of a general prediction about the future. Predictions are guesses about what might happen in the future. In "prediction" sentences, the subject usually has little control over the future and therefore USES 1-3 do not apply. In the following examples, there is no difference in meaning.

Ex:
SBY will be the next President.
SBY is going to be the next President