Future with 'will' or 'be going to'

• Look at those black clouds. It is going to rain soon.

• Look at those black clouds. It will rain soon.

• They will fight.

• They're going to fight.

• You will be rich.

• You are going to be rich

• I've got a toothache. I will see my doctor.

• I've got a toothache. I'm going to see my dentist.

• I will play tennis.

• I'm going to play tennis.

• I'll catch cold if I go out tonight.

• I'm going to catch cold if I go out tonight

• Will you help me?

• Are you going to help me?

• They're going to sleep.

• They will sleep.

• Freeze or I'm going to shoot.

• Freeze or I'll shoot.

Look at these clouds. It is going to rain.

• intention

• prediction based on opinion

• prediction based on evidence