i'm sorry()so long,i forgot to tell you in advance where i h

来源：学生作业帮编辑：百度作业网作业帮分类：英语作业时间：2024/07/20 14:03:54

i'm sorry()so long,i forgot to tell you in advance where i had put my key.
这里有明显的现后关系吗?只因为forgot是用的过去式,所以要用完成时态吗?完成时态只能在谓语动作之前的动作才能用吗?难道就没有别的用法了吗?

答案：to have kept you waiting

在说话人说此句话的时候,keep you waiting...该动作已经发送了,所以用不定式的完成形式.
此时它和forgot关系不大,倒是此句中的had put和forgot有关系.因为put my key发生在forgot to tell之前,所以用“过去的过去”即过去完成时.

其实用to keep you waiting也是可以的.为了避免繁琐,在不影响理解的前提下,常常用非谓语动词的一般形式代替完成形式.

再问： ____twice,the postman refused to deliver our letters unless we chained our dog. a.being bitten b.bitten c.having bitten d.to be bitten.为什么不能用完成时呢？被咬这个动作已经完成了啊，to be bitten，to不是也可以当原因状语的吗？为什么这里不能呢？
再答：不定式放在句首只做目的状语。

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