В английском алфавите 26 букв. Из них

be going to – может использоваться перед to be и глаголами не использующихся в continuous.

I am going to think about it.

I am sure I am going to like it.

She is going to have a large mansion just outside the city.

He is going to be an excellent student.

be going to –с глаголами go и come не употребляется лучше с ними использовать present continuous:

I am going вместо I am going to go

I am coming вместо I am going to come

Are you coming with me?

We are leaving home early.

BE GOING TO versus WILL + INFINTIVE (планы на будущее)

* be going to-действие запланировано заранее. WILL + INFINITIVE – действие не планируется заранее оно внезапное.

I have bought some bricks and I am going to build a garage.

There is somebody at the hall door. I’ll go and open it.