Future Forms

• Use the present simple for fixed timetables, schedules and arrangements.
  Don't forget it closes at 10:30 on Sundays.
• Use will for immediate decisions made at the same time as you speak/write.
  I'll call you later.
• Use will for something you think, guess or calculate about the future.
  Most of the family probably will be there.
  
  • Use be going to for fixed plans or arrangements.
    We're going to have a barbecue.
  • Use be going to for predictions you make because of a present evidence.
    Judging from the grey sky, it's going to rain anyway.
  • Use present continuous for a personal intention or arrangement.
  Gloria and I are meeting at about 9:30.
  • Use future continuous for something that will be in progress during a period of time in the future. I'll be working all weekend.
  • Use Future Perfect for something that will be finished before a time in the future.
    Maybe you'll have done your various duties by the end of the evening.