I am meeting my friends at the cinema after work tomorrow. (fixed plan)

I am going to be a doctor when I finish university. (prediction)

I will be studying at nine tomorrow evening. (use the future continuous to express what will be happening at a specific moment in the future.)

Jack is having a dinner party next Saturday. (events which have been planned for the future)

Can I borrow 90 dollars? I will pay you back tomorrow. (They just decided this plan)

I am going to go home after this lesson. (It's a plan)

Look at those clouds! It is going to rain! - Use the future with "going to" when you can see that something is about to happen.

Unless he arrives soon, we will not go to the party. (Use the future with "will" in first conditional sentences)

I'm going home. I'll see you tomorrow. Bye! (they just decided)

Peter knows that he is going to fly to Chicago next week. (future plans)

I am going to be rich when I am older. (prediction that we're not sure about)

I am flying to London tomorrow night. (fixed plan)

We'll go out for dinner when he gets in. (use the future with "will" when using "when" or "if")