The future perfect continuous tense is a verb form used to talk about actions or events that will have been happening continuously until a specific point in the future. Realistically it's not used very much.
| Positive | Positive short form | Negative | Negative short form |
|---|---|---|---|
| I will have been finishing | I'll have been finishing | I will not have been finishing | I'll not have been finishing |
| You will have been swimming | You'll have been swimming | You will not have been swimming | You'll not have been swimming |
| She, he, it will have been working | She, he, it'll have been working | She, he, it will not have been working | She, he, it'll not have been working |
| We will have been running | We'll have been running | We will not have been running | We'll not have been running |
| They will have been ending | They'll have been ending | They wTheyll not have been ending | They'll not have been ending |