非谓语动词之分词

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①一般时  doing

②完成时  having done

现在分词的完成时主要用于状语从句，强调分词的动作发生在谓语动作之前。简单地说，如果状语从句的时态是完成时，在省略时，也用分词的完成时。

如：After he had waited for a long time, he was asked into the office.

=Having waited for a long time, he was asked into the office.

在等了很长时间之后，他被叫进了办公室。

Since I have never been to China,I know little about the country.

=Never having been to China,I know little about the country.

因为没去过中国，我对这个国家知道的很少。

(2)现在分词的被动语态

①现在分词的被动being done

②现在分词完成时的被动 having been done

现在分词的被动语态和完成时的被动语态，主要用于作状语和定语。注意下列每对句子中分词与从句的时态和语态。

如：Having been kept indoors for the whole morning, the children became impatient.

=As they had been kept indoors for the whole morning, the children became impatient.

孩子们在室内待了一上午，开始坐不住了。

I heard the noise of furniture being moved upstairs.

=I heard the noise of furniture that was being moved upstairs.

我听到楼上正在搬家具的声音。