A jewelry shop is reported in the local newspaper (to have been robbed) last night..

题目

A jewelry shop is reported in the local newspaper (to have been robbed) last night..
A jewelry shop is reported in the local newspaper (was robbed) last night..为什么错了,答案是（to have been robbed） 为什么用to 什么结构 为什么用完成时 不是last night

答案

A jewelry shop is reported in the local newspaper (to have been robbed) last night.
= It is reported in the local newspaper that a jewelry shop was robbed last night.
句型：
主语（人或物）+be +vt-ed + to -v ...
=It +be +vt-ed that 主语（人或物）+ V...
此处的be+vt-ed 中vt-ed常用：said,thought,believed,reported等
to-v：表示将来,所以第二个句子中的V常用将来；
to be doing表示进行,所以第二个句子中的V常用进行；
to have done表示完成,所以第二个句子中的V过去式或完成式.
这里因为有个last night,所以用过去式.
如：
He is said to come
=It is said that he will come.
The boy is thought to be staying home.
=It is thought that the boy is staying home.
He is believed to have come.
It is believed that he has come.