Hello teachers, One of the uses of 'be going to' is to express plans for the future that have been decided in the past. That's what more or less, most definitions say. So, I think it is correct to use 'I am going to' in the dialogue below because Molly made that plan before the moment of speaking. Having said that, shouldn't the definition be 'Plans for the (immediate) future that have been decided in past'. I think 'immediate' should be in parentheses. Situation: Molly and her mother are at home. A: Why are you switching on the computer? B: Because I am going to write a couple of e-mails to my friends, mum. Thanks in advance.