This future tense is used to refer to arrangements (very detailed plans). They already have a defined time, place and people involved in them.

"The train is going to arrive at 9 o'clock tonight." (What tense is it? Correct or not?)

Are you free tomorrow evening? We ________ (have) a party.

"I'm sorry I made you so angry. I promise I won't do it again." (What tense is it? Correct or not?)

"The sky is very dark. I think it will rain." (What tense is it? Correct or not?)

The ferry to the island ________ (leave) at 7 p.m.

Everything is already planned. We _____________ (go) to Greece for Holidays next month.

"What time do you finish work on Mondays?" (What tense is it? Correct or not?)

"Sorry, I can't see you this weekend because I am visiting my grandparents in Merida." (What tense is it? Correct or not?)

"A: Where are you going? B: I will buy something for dinner." (What tense is it? Correct or not?)

To make a prediction based on evidence we see or hear, we use...

To talk about predictions without evidence, hopes, promises or decisions in the moment we use...