3.在“it is a pity that”等从句中

“it was/is a pity/shame that”等结构后的主语从句中要用虚拟语气，即“should+动词原形”，或只用动词原形。

It is a pity that she not be here．

可惜她不在这儿。

It is a burning shame that the children should have to beg in the street．

孩子们竟然要沿街乞讨，真是奇耻大辱。