We use be going to to talk about an action in the future. The form is:
subject + present tense be verb + going to + verb(-ing)
•We use be going to when we talk about planned actions. A planned action is an action that is going to happen in the future, but was decided in the past.
Next week, we’re going to buy new furniture.
•In spoken English, we often shorten going to to “gonna”. This form is used in casual conversation, but never in formal writing.