作业帮过去完成时的被动语态
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过去完成时的被动语态
过去完成时的被动语态
过去完成时的被动语态
过去完成时
主语+had +过去分词
We had finished learning Book1 till last week.
过去完成时的被动语态
主语+had been +过去分词
Book1 had been finished learning(by us )till last week.
过去完成时一般情况下及与过去相比，过去的过去。
形式为had加上动词过去时
如果为be动词则为had been
被动就是had been done
完成时态have done，被动将been加中间。 (过去完成时had done也包括在内)。 例：1、主动：We have studied English for 3 years and on at the spare-time school. 被动：English has been studied for 3 years by us and on at the spare-time...
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完成时态have done，被动将been加中间。 (过去完成时had done也包括在内)。 例：1、主动：We have studied English for 3 years and on at the spare-time school. 被动：English has been studied for 3 years by us and on at the spare-time school. have随新主语变为has) 我们已经在夜校里断断续续地学了三年英语了。 2、主动：They had produced 100 tractors by the end of last year. 被动：100 tractors had been produced by the end of last year. 到去年年底我们已生产出一百台拖拉机。 3、主动：They have set up a power station in their home town. 被动：A power station has been set up in their home town. 他们的家乡建立了一座发电站。 4、主动：They have warned us to be careful of rats. 被动：We have been warned to be careful of rats by them. 他们已提醒我们要注意老鼠。
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已经做的事情，并不一定要用过去完成时。我们理解的“完成”，因为send是个一次性的动词，所以说出口的时候本身就已经是完成状态了。不像read等词，事情做了还有可能没做完。
楼主的句子在工作里使用的话，谁都能明白，不过其实用不了这么麻烦，过去时+被动就足够了。如果要强调“做完了”，用already，语气效果已经够了。如下：
Samples was sent out by 1-Fa...
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已经做的事情，并不一定要用过去完成时。我们理解的“完成”，因为send是个一次性的动词，所以说出口的时候本身就已经是完成状态了。不像read等词，事情做了还有可能没做完。
楼主的句子在工作里使用的话，谁都能明白，不过其实用不了这么麻烦，过去时+被动就足够了。如果要强调“做完了”，用already，语气效果已经够了。如下：
Samples was sent out by 1-Fan-2010 already
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