English grammar: Future perfect continuous

What this grammar point covers

The future perfect continuous is an English tense used to show that an action will be ongoing up to a specific point in the future.

When to use it

Use this tense to talk about how long something will have been happening up to a certain time in the future. It often focuses on the duration of an activity.

Key forms

• will have been + verb-ing
• Example: will have been working

Examples

Tips

• Remember to use 'will have been' before the verb with -ing.
• This tense is often used with time expressions like 'by the time', 'for', or 'when'.
• Don’t use this tense for actions that are completed instantly; it’s for ongoing actions.