11. Lisa made a great decision when she learnt to talk. “I’m going to be the President of the USA.”
12. Homer is making a decision: “I’ll have another beer. No, I won’t – I’ll have two more beers.”
13. Bart has detention tomorrow after school. Detention is at five o’clock tomorrow.
14. Marge is very busy. “Homer’s seeing the doctor next Monday... Lisa’s having her birthday party on Tuesday ... We’re having fish for supper on Friday...”
15. “ I’m going to be the President of the USA.” GOING TO is for decisions which you have already made.
16. “ I’ll have another beer. No, I won’t – I’ll have two more beers.” WILL is for decisions that you make while you’re talking.
17. Detention is at five o’clock tomorrow. PRESENT SIMPLE is for timetables , etc.
18. “ Homer’s seeing the doctor next Monday... We’re having fish for supper on Friday...” PRESENT CONTINUOUS is for plans that you make with (or for) other people.