Future forms in English include will and be going to. Will expresses a spontaneous decision while be going to expresses an intention or arrangement. Examples show will used for a spontaneous decision to download a song and be going to used to express the intention to become an architect after getting an internship, while the progressive form is used to talk about meeting friends that night at a bar.

1. Future Forms
In English

2. Future Forms
Present
will (‘ll) (be) going to
Progressive
Result of a
spontaneous To express an To express an
decision. intention arrangement

3. Examples
“I love this song! I’ll download it from iTunes.”
“I want to get that internship because I’m going to be
an architect.”
“I’m meeting my friends tonight at the bar.”