過(guò)去完成進(jìn)行

過(guò)去完成進(jìn)行時(shí)用來(lái)描述一項(xiàng)活動(dòng)在其他事情發(fā)生之前已經(jīng)進(jìn)行了多長(zhǎng)時(shí)間。

這種時(shí)態(tài)常與下列時(shí)間短語(yǔ)連用:

... for X hours, days, months, 等等

... since Monday, Tuesday, 等等

基本結(jié)構(gòu)

肯定的

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

主語(yǔ)+ had + been +動(dòng)詞+ ing +賓語(yǔ)(s) +時(shí)間表達(dá)

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(yǔ)+ had not (hadn't) + been +動(dòng)詞+ ing +賓語(yǔ)(s) + time

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

問(wèn)答

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

(疑問(wèn)詞)+ had +主語(yǔ)+ been +動(dòng)詞+ ing +賓語(yǔ)(s) +時(shí)間表達(dá)

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

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