過去完成進(jìn)行

過去完成進(jìn)行時用來描述一項活動在其他事情發(fā)生之前已經(jīng)進(jìn)行了多長時間。

這種時態(tài)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(jié)構(gòu)

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(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+ 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(dá)

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

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