The Future Progressive is used:

• to refer to an action that will be completed before a specific time in the future

• to refer to an action that will happen repeatedly in the future

• to refer to an action that will be in progress at a specific time in the future

• to refer to an action that will happen spontaneously in the future

The Future Perfect Simple is used:

• to refer to an action that will be ongoing at a specific time in the future

• to refer to an action that will happen at the same time as another action in the future

• to refer to an action that will happen immediately in the future

• to refer to an action that will be completed before a specific time or another action in the future

The Future Perfect Progressive is used:

• to show the duration of an action up to a certain point of time in the future

• to refer to an action that will happen before another action in the future

• to refer to an action that will happen spontaneously in the future

• to refer to an action that will start in the future and continue indefinitely

The Future going to is used to:

• to refer to an action that may or may not happen in the future

• to refer to intentions or decisions that have already been made or predictions based on evidence

• to refer to an action that will happen far in the future

• to refer to an action that has already happened

The expression be (just) about to + base form is used:

• to refer to an action that will happen very soon

• to refer to an action that will happen unexpectedly in the future

• to refer to an action that happened recently

• to refer to an action that will happen after a long delay

The Present Progressive is used:

• to refer to habitual actions in the future

• to refer to actions happening in the distant future

• to refer to personal plans and arrangements

• to refer to actions happening right now

The Present Simple is used:

• to refer to actions happening at the moment

• to refer to actions happening in the past

• • to refer to actions happening in the distant future

• to refer to official programmes and timetables