型態
未來完成式是由兩個要素組成：
動詞 to have 的未來簡單式 (will have) + 主要動詞的過去分詞
| 主詞 | + will have | + 主要動詞的過去分詞 |
|---|---|---|
| He | will have | finished. |
| I | will have | finished. |
未來完成式，以 to arrive 為例
| 肯定句 | 否定句 | 疑問句 | 否定疑問句 |
|---|---|---|---|
| I will have arrived | I won't have arrived | Will I have arrived? | Won't I have arrived? |
| You will have arrived | You won't have arrived | Will you have arrived? | Won't you have arrived? |
| He will have arrived | He won't have arrived | Will he have arrived? | Won't he have arrived? |
| We will have arrived | We won't have arrived | Will we have arrived? | Won't we have arrived? |
| They will have arrived | They won't have arrived | Will they have arrived? | Won't they have arrived? |
作用
未來完成進行式涉及未來未完成的動作。當使用這個時態時，我們對未來會有所期望，並且反觀在未來某時間會完成的動作。大部分常與時間詞一起使用。
舉例
- I will have been here for six months on June 23rd.
- By the time you read this I will have left.
- You will have finished your report by this time next week.
- Won't they have arrived by 5:00?
- Will you have eaten when I pick you up?