to talk about things we are or haven't decided yet

A: Will you come to the party?

B: I don't know yet. I'll probably visit my granny this weekend.

to express

I hope I'll get this position.

to express

A: Do you have any plans for the weekend?

B: No, why?

A: We are going to the park to cycle. Would you like to join?

B: Thanks. I will come.

to express , and warnings

Mum: Sarah, why is your room so messy?

Sarah: Sorry, mum. I will clean it up after the home task.

predictions that are based on or intuition, and not on present evidence

I don't think my parents will let me move out.

Be Going To is used: