未來完成式(will have done)

未來某時「之前已完成」+ 未來完成進行、by then

未來完成式(will have done)

🎯 這一課你會學會

講「到未來某個時間點,已經完成的事」——「到明年,我就畢業了」。用 will have + 過去分詞。再加一個講「持續到未來某點多久」的未來完成進行式。這是把時間軸講到最精準的工具。

💬 先聽一段對話

Mia: Let's start the project next month.（我們下個月開始這專案吧。) Jun: Good. By the end of the year, we'll have finished the first part.（好。到年底,我們就會完成第一部分。) Mia: And by next summer?（那到明年夏天呢?) Jun: By then, I'll have been working on this for two years!（到那時,我做這個就滿兩年了!)

🔑 關鍵句型

主詞 + will have + 過去分詞 = 到未來某時之前,已完成。
- By 2030, I will have graduated.
未來完成進行:will have been + V-ing = 到未來某時,已持續(多久)。
- By December, I**'ll have been living** here for ten years.
常配 by + 未來時間(by then / by next year / by the time…)。

🧩 文法點:把「完成」放到未來

① 未來完成 = will have + 過去分詞

想像你「站在未來某個時間點,回頭看」——那時這件事已經做完了:
- By the time you arrive, I will have cooked dinner.（你到時,我已煮好晚餐)
- The train will have left by 6.（六點前火車就開走了)
關鍵字:by + 未來時間點(by then、by 2030、by the time + 現在式)。

② 未來完成進行 = will have been + V-ing

強調「到未來那一點為止,持續了多久」(重點在時間長度):
- Next month, I will have been studying English for three years.（到下個月,學英語滿三年)
跟現在完成進行(have been doing)同邏輯,只是站到未來看。

③ 三種「未來」一次分清:

說法	意思	例句
will do	單純未來(會做)	I'll finish it.
will be doing	未來某時正在做	I'll be working at 3.
will have done	未來某時之前已做完	I'll have finished by 3.

④ by vs until(常錯):

by + 時間 = 「在…之前(某個動作完成)」:Finish it by Friday.
until + 時間 = 「一直到…(持續)」:I'll wait until Friday.
未來完成配 by,不配 until。

📒 高頻單字

單字	KK 音標	中譯	例句
by then	/baɪ ðɛn/	到那時	By then, I'll be done.
graduate	/ˈɡrædʒuˌet/	畢業	I'll have graduated.
deadline	/ˈdɛdˌlaɪn/	截止期限	meet the deadline
complete	/kəmˈplit/	完成	We'll have completed it.
within	/wɪˈðɪn/	在…之內	within a year（一年內)

🗣️ 發音提醒

will have 口語常縮 will've /wɪləv/ 或「will-əv」;I'll have → 「aɪl-əv」。
graduate(動詞)/ˈɡrædʒuˌet/ 尾音 /et/;(名詞)/ˈɡrædʒuɪt/ 尾音 /ɪt/。
deadline /ˈdɛdˌlaɪn/:dead + line。

✍️ 開口練習

練習 1:未來完成造句(by + 時間)。

By ＿(未來時間), I will have ＿(過去分詞).

練習 2:哪一種未來?

At 8, I ＿ (eat) dinner.（進行)→ 'll be eating
By 8, I ＿ (eat) dinner.（已完成)→ 'll have eaten

練習 3:未來完成進行(講持續多久)。

By next year, I'll have been ＿＿ing for ＿ years.

🎒 帶走

will have + 過去分詞 = 到未來某時已完成(配 by + 時間)。
will have been + V-ing = 到未來某時已持續多久。
三種未來:will do(會做)/ will be doing(正在做)/ will have done(已做完);by(之前)≠ until(一直到)。

下一課,把過去的四個時態一起用,說一個有層次的完整故事(敘事時態)。