過去完成進行

過去完成進行時用來描述一項活動在其他事情發生之前已經進行了多長時間。

這種時態常與下列時間短語連用:

... for X hours, days, months, 等等

... since Monday, Tuesday, 等等

基本結構

肯定的

Subject + had + been + verb + ing + object(s) + time Expression

主語+ had + been +動詞+ ing +賓語(s) +時間表達

She had been waiting for two hours when he finally arrived.

否定的

Subject + had not (hadn't) + been + verb + ing + object(s) + time Expression

主語+ had not (hadn't) + been +動詞+ ing +賓語(s) + time

They hadn't been working long when the boss asked them to change their focus.

問答

(Question Word) + had + subject + been + verb + ing + object(s) + time Expression

(疑問詞)+ had +主語+ been +動詞+ ing +賓語(s) +時間表達

How long had Tom been working on that project when they decided to give it to Pete?

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