白做了、本來要(needn't have / was supposed to)

🎯 這一課你會學會

表達幾種細膩的過去語氣:「你根本不用做(卻做了)」「本來就不必」「本來應該要(卻沒)」。用 needn't have / didn't need to / was supposed to。這些差一點,意思差很多,是 B2 的精準所在。

💬 先聽一段對話

Amy: I brought snacks for everyone.（我幫大家帶了點心。) Ken: Oh, you needn't have! There's already tons of food.（喔,你根本不用帶的!已經一堆吃的了。) Amy: Ha, oops. I was supposed to check first.（哈,糟。我本來該先問的。) Ken: No worries. I didn't need to eat lunch, so I'm starving anyway!（沒事。我本來就不用吃午餐,反正我很餓!)

🔑 三個容易混的結構

• needn't have + 過去分詞 = 做了,但其實不必(白做了):You needn't have waited.（你不用等的,卻等了)
• didn't need to + 原形 = 本來就不必(通常沒做):I didn't need to buy milk.（不必買,所以沒買)
• was / were supposed to + 原形 = 本來該做/約好要做(常暗示沒做到):I was supposed to call her.（本來要打,卻沒打)

🧩 文法點:差別在「做了沒」

① needn't have done vs didn't need to do(最經典的區別):

• needn't have + 過去分詞 = 「做了,但事後發現不必」——動作發生了,是白費工:
  • You needn't have cooked — we already ate.（你煮了,但我們吃過了)
• didn't need to + 原形 = 「不必做」——通常沒做(不需要就沒做):
  • I didn't need to cook — we ate out.（不必煮,所以沒煮)
• 一句話:needn't have = 白做了;didn't need to = 沒必要(多半沒做)。

② was/were supposed to = 本來的安排/期待(常沒實現):

• I was supposed to meet him at 6, but I forgot.（本來約好,卻忘了)
• It was supposed to rain, but it didn't.（本來說會下雨,結果沒)
• 也可講「一般認為應該」:You're supposed to take off your shoes here.（這裡照規矩要脫鞋)

③ 跟 B1 的 should have 對照:

• should have + 過去分詞 = 當初該做卻沒(後悔):I should have called.
• needn't have + 過去分詞 = 當初不必做卻做了(白費):I needn't have called.
• 兩個剛好相反:一個「該做沒做」、一個「不必做卻做了」。

📒 高頻單字

單字	KK 音標	中譯	例句
bother	/ˈbɑðɚ/	費事、麻煩	You needn't have bothered.
supposed to	/səˈpozd tu/	本來應該	I was supposed to go.
worry	/ˈwɝi/	擔心	Don't worry.
starving	/ˈstɑrvɪŋ/	餓壞了	I'm starving.
already	/ɔlˈrɛdi/	已經	We already ate.

🗣️ 發音提醒

• needn't /ˈnidənt/:中間 d 輕、尾 t 輕。
• supposed to 口語連讀「sə-POHZ-tə」(d 幾乎不見)。
• needn't have →「NEE-dən-təv」。

✍️ 開口練習

練習 1:needn't have 還是 didn't need to?

• You brought an umbrella, but it was sunny. → You ＿ (bring) it.（做了卻不必)→ needn't have brought
• It was sunny, so you left the umbrella home. → You ＿ (bring) it.（不必,沒帶)→ didn't need to bring

練習 2:was supposed to(本來要卻沒)。

I was supposed to ＿, but ＿.

練習 3:should have vs needn't have。

• 該做沒做 → I should have ＿.
• 不必做卻做 → I needn't have ＿.

🎒 帶走

• needn't have + 過去分詞 = 做了但白做;didn't need to + 原形 = 不必(多半沒做)。
• was/were supposed to = 本來該做/約好(常沒實現)。
• 對照 B1 的 should have(該做沒做)——needn't have 剛好相反。

下一課,把推測玩到全時態:對現在、過去、進行中的事都能有把握地推測。